Which port are you using? The cable must be directly connected from hAP unit port 1 (no other port) to your computer. in the computer, disable wifi and other interfaces, only the LAN interface that is connected to router port 1 must be enabled
OP seems to be very inexperienced, so let’s try to make things as clear as possible.
Try using winbox, as mentioned by @erlinden the neighbours tab page will display the list of Mikrotik devices found by winbox. If the list remains empty, try connecting computer to different ether ports of your router, discovery isn’t allowed through all ports (depending on configuration).
If router does show on the list, try clicking its MAC address … this way winbox will connect via MAC and will thus bypass any IP configuration problems there might be.
What @normis writes is true for netinstall and the opposite is true for winbox (with default configuration).
Probably netinstall requires port 1 (which is by default the WAN port and therefor will not have an IP address).
After a succesful netinstall, you should connect to any other port then port 1 to manage the device.