I find that the best locations for support have been either the FAQ for the program or doing google searches. If you are having problems installing GAIM you could start with the FAQ here http://gaim.sourceforge.net/faq.php
and see if that helps. The first couple of items are with regards to problems installing. Without knowing the install problem you are having it is hard to help out.
A couple other places I would go is to http://www.linux-mandrake.com/en/fdoc.php3
for documentation specific to Mandrake and for less specific information I always used to go to the Linux Documentation project at www.tldp.org
which I am currently having trouble getting to.