I started a thread a while back on the same subject, but I kinda forgot how to. I know you need at least 75 posts, and I got that, this is my 76th post. Please help!
Go to user CP (above left) then Edit Avatar (bottom of first box on left) then either stick in the url of your image or browes your pc for an image. If i remember right it must either be 75 x 75 px or 80kb but it tells you one you go to upload it. also its in the FAQ/rules link above
If you can't do it immediately, it's because the av option is enabled every so often, not immediately, so give it a little while.
I can't believe Bindi left this thread open just in case Laosa asked who to make the cheque out to...