You will need to create a separate, new profile for TGIF, then in the Connectors tab you select MMDVM as the protocol and enter the server's address as tgif.network and password will be your own TGIF password as extracted from the registration process on their web site. openSPOT might have a ready made TGIF entry you can select so that you don't need to change the server address.
It appears to be explained here:
https://tgif.network/help.php
which shows you how to get your password into the clipboard so you can save it into the openSPOT.
I am not a TGIF user but this is what I gleaned from a bit of web searching.