1. Look at Side bar Click "User Account..."
2. On User account screen just above where you can change password there should be some options "View Yourself" Yourposts ect Click on "Your Files"
3. Now click Browse and find your Avatar thats is 100x100 pixels or smaller and under 512kb.
4. Back to "User Account..."
5. Where is says Avatar Image click on it and the file you uploaded should be there, select on it and hit save user settings and voila Avatar.
Hope that helps, if unclear just ask ill try to explain more thoroughly.
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Bode - 100 Holy Paladin - Lightbringer