first connection problem

Hi. Just bought https://mikrotik.com/product/RB750Gr3 and connected to my laptop with RJ45 cable, on first port (Internet). So between my laptop and router there is only that network cable. The default IP written on the box 192.168.88.1, I’m running ubuntu, so I set static IP to 192.168.88.5, netmask 255.255.255.0, gateway 192.168.88.1. I cannot connect to mikrotik backend via browser, nor via winbox (wine). What’s wrong and how to connect to the mikrotik backend ?
Thanks.

https://wiki.mikrotik.com/wiki/Manual:First_time_startup

Use another port, the first one is usually configured as WAN, i.e. with DHCP client and access to router blocked on that port. The other ports should be LAN with DHCP server.

yes, on port 2 accessed routerOS through winbox, thanks Sob!