Avatar - This refers to the little picture you can have under your name. To get an Avatar, click the "My Account" link and go to Edit Avatar. There are Avatar size restrictions so if your picture is too large, it will either be rejected or it will be resized to fit the restrictions. If your picture is too large, you may need to resize it. The same rules for Signatures apply to Avatars.
Also, overuse of question marks = sure sign of a diseased mind.