u will need to go to a place to start a homepage...try
http://www.boomspeed.com alot of us use that...sign up and upload your pic to get the URL address. then go to your 'user cp' above and look for edit options i believe, find the box for signature and there u should be set...and u can always check out the 'f.a.q' above for more help....
hope that gives u a little bit of info!