There are various ways to get in contact with the GOIM developers or other GOIM users.
Forums
One of the easiest way is to visit the forums. in the Guestbook/Feedback section you
can even post withou signing up. So visit the
Discussion Forum.
IRC Channel
You can also join your publicly available IRC channel #goim on the freenode irc network.
Grab an IRC client, connect to irc.freenode.net and /join #goim ;)