To the best of my knowledge, Furtopia does not host regular forums like the type we're using now. It does host websites for artists though. The only forum application you can get here is for a "community forum" which would be like what's in the Artists, Authors, & Musicians Forum, or the Communities Groups Forum.
EDIT: If you go to the Greetings forum and check the "Mod Post of Doom" that we usually give new members, you'll see links for the various applications Furtopia offers.