I hope shortening your username is not an offence
. I'll have a go at describing a simple setup through Winbox. I'm not a Mikrotik expert and I'm happy to be corrected by anyone that is. This works for me, but is not neccesarily best practice. Hopefully I haven't made any miktakes or ommisions when walking through the config, but there is always the possibility
This might be a long post, but I'll take one of my hAP's out of play and work through reconfiguring it step by step using Winbox to keep it as simple as possible. I am debating whether cap might be a better starting point, but let's go with the Home AP dual and see.
I'm going to assume you will give your Mikrotik box a static IP address as then you will always know where it is. Setting it up with a dynamic address is easier in that some of the later config, such as setting DNS is not required, but I dind it harder to manage if I don't automatically know what ip address the Miikrotik is on. Other people will do it differently, it's your choice.
You may have to change your local computer IP address settings at points on the way through this, depending on whether you use dynamic addressing or static. I didn't becasue I was using dynamic and always picked up a dhcp address.
Making sure that the network cable is plugged into the Mikrotik in a port other than 1 (this will come up as internet straight after the config), go into Winbox and making sure you have a backup of the current config, reset the configuration (use the system / reset configuration option) without ticking any of the boxes.
I then connected my laptop straight to the hAP and I can see the hAP on 192.168.88.1 and connected via Winbox. I got a message about default config and just said ok.
I then went into quick set and selected Home AP Dual and filled in the wireless details incl password, set the Internet address as automatic and for the local network I gave it a static address in the main home range (ensuring that it wasn't within any the DHCP pool which in your case will be allocated by your main router). I unclicked firewall router, DHCP Server and NAT as you won't use any of these for an access point.
Then you can connect back to the main network and plug your Mikrotik back in where it belongs. Just as a note of caution though, to be 100% safe, avoid plugging anything to ether1 at this stage until we have finished the config.
back into Winbox again and you should now see the Mikrotik on the network on the address you gave it. Effectively, it should now be doing everything you want it to do and will be behaving as a switch, with the wireless bridged onto the switch, will be on the network within your normal ip address range and will not be handing out 192.168.88.1 addresses. Any addresses for equipment connected to this switch should now be handed out by your main router.
This unfortunately is with one exception. Port ether1, still thinks it is a port to the Internet. So to be able to use port 1 to plug anything into, a little further config is required.
So now you will go into bridge over in the menu on the left, and then select the tab that says ports. Click on the + button and add ether1 into the bridge with default settings.
Then go to the IP menu on the left and to the sub menu that is addresses. You will see your static IP address in here. Double click on it to open it up and change the interface from in my case (ether 2) to be bridge.
The next few of steps will probably not be required if you have set the IP address dynamically, athough you will need to move the dhcp client up onto the bridge, but if you have used a static IP address then they will be needed for the Mikrotik box to have internet access.
Go to IP and DHCP Client, highlight the default entry and click the - (minus) button to delete the default config entry. This is getting a dynamic entry for ether1 for internet which you don't want anymore.
Go into IP and DHCP server, select the Networks tab and delete the default entry using the - button.
Go into IP and then pool and again use the - button to delete the default pool
Go into the IP menu again and this time the sub menu route. Click the + button in the window that comes up, type the address of your main router into the gateway field and hit ok. This gives the Mikrotik access to the internet to ensure that it can get updates etc.
Go to IP again and this time to DNS. Enter your DNS servers, probably from your ISP into the Servers field. You can get multiple addresses in here by using the up down arrows to the right of the box. I have my own primary and secondary DNS servers and so in the config I post these will be local addresses. Yours will need to be those supplied by your ISP.
Go into IP then firewall and delete all entires in the Filter rules, NAT and Mangle tabs apart from the special built in rules which I don't think it will let you delete. As this is internal you shouldn't need any firewall rules.
That should now be it. I can't fully test this as it conflicts with the VLAN's on my network and if I changed it to allow me to test, then the config wouldn't be any use to you. However, using port 1 as the uplink to my main switch, I can connect to the internet through the LAN ports. I can connect via WiFi and browse the internet from my phone and DCHP from the DHCP server is coming through properly, so IP addresses are autmatically assigned. As a last test the Mikrotik box can connect to the internet and run for example a trace route to google successfully. Hopefully you should now be fully working, enjoying a beer and be proud that you have managed to mess around with network configuration and live to tell the tale.
The config that this has generated is very simple after all of that work and is listed below, but if you wanted use it as config will need changing for your IP/MAC addresses etc.
Hope this helps in some way. Now to restore my hAP back to a working state
# model = RouterBOARD 952Ui-5ac2nD
# serial number = XXXXXXXXXXXX
add admin-mac=XX:XX:XX:XX:XX:XX auto-mac=no comment=defconf name=bridge
set [ find default-name=wlan1 ] band=2ghz-b/g/n channel-width=20/40mhz-Ce \
disabled=no distance=indoors frequency=auto mode=ap-bridge ssid=Master2 \
set [ find default-name=wlan2 ] band=5ghz-a/n/ac channel-width=\
20/40/80mhz-Ceee disabled=no distance=indoors frequency=auto mode=\
ap-bridge ssid=Master5 wireless-protocol=802.11
add comment=defconf name=WAN
add comment=defconf name=LAN
/interface wireless security-profiles
set [ find default=yes ] authentication-types=wpa-psk,wpa2-psk mode=\
dynamic-keys supplicant-identity=MikroTik wpa-pre-shared-key=password \
/interface bridge port
add bridge=bridge comment=defconf interface=ether2
add bridge=bridge comment=defconf interface=ether3
add bridge=bridge comment=defconf interface=ether4
add bridge=bridge comment=defconf interface=ether5
add bridge=bridge comment=defconf interface=wlan1
add bridge=bridge comment=defconf interface=wlan2
add bridge=bridge interface=ether1
/interface list member
add comment=defconf interface=bridge list=LAN
add comment=defconf interface=ether1 list=WAN
add address=192.168.0.33/24 comment=defconf interface=bridge network=\
set allow-remote-requests=yes servers=192.168.0.3,192.168.0.4
/ip dns static
add address=192.168.0.33 name=router.lan
add distance=1 gateway=192.168.0.1