ssh to [email protected] (or whatever the IP address is.) default password is ubnt, if it something else, I hope you wrote it down when you set it. :)
You must reset the AP to defaults before changing the inform ip address. To do so execute the following command
syswrapper.sh restore-default
This will reboot the radio and disconnect your SSH session. Once it comes back online, you will need to reconnect.
Now issue the set-inform command with the IP address of your Unifi controller.
set-inform http://192.168.0.1:8080/inform set-inform https://domain.pl/inform
The AP should connect to the controller within a few seconds and you are set.
Z <https://community.spiceworks.com/how_to/9692-manually-setting-the-controller-address-for-a-unifi-ap>