Open the admin UI using "?admin" (for example: https://example.com/?admin) to configure your settings.
If this is the first time, login with user "admin" and the password from the file /*/data/_data_/_default_/admin_password.txt, else use your own credentials.
At login, keep the TOTP field empty if you didn't set that up.
This configuration file can be found at: /*/data/_data_/_default_/configs/application.ini
_default_ is a subdirectory in a single domain installation, when multiple domain installations are used, your web domain is placed instead of "_default_".