When you’re logged in, go to the top of the screen and select “Profile”. From there you will go to the screen with all your personal info. Scroll down to the bottom of the screen and you’ll see the “Avatar control panel”. From there you can select “browse” and upload an avatar from your computer. The max dimension is 95 x 95 pixels. If you have a problem with it, e-mail me the pic and I’ll upload it for you.
You can also select from a drop down menu of assorted avatars.