To connect necessary is installation of x2go client available at https://www.x2go.org. Program is available for Windows, macOS and GNU/Linux systems.
In X2Go client create a new session using following settings:
x2go.wmi.amu.edu.pl
Then one may log in using LABS domain password.
Advantage of using a terminal server is that session will be active for up to 8 hours since disconnect - therefore it is possible to leave running programs and disconnect with a server and then reconnect e.g. from other computer.