If you look at the top of the page you will see some small boxes labeled "user cp" "register" calendar etc. Click on "user cp" then click on "edit options", scroll down to the bottom where you see "avatar" and "more information". Click on "more info" and there you will see if you qualify for a picture (you have to have so many posts) but it basically takes you step-by-step through the process of adding one. Hope I explained it to you good enough.