John there is lots of information in the "HELP' section. I copied this information amd will paste it here. Maybe people are not finding this information .. Ask questions about any part you do not understand...
What is an avatar?
An avatar is a picture or illustration of you (or another picture of your choice that represents you). It is displayed with your posts and replies in message boards and groups and also on your My Page.
How do I set my avatar?
First, choose a digital photo or an illustration you wish to use. Accepted formats are jpg, gif and png. For best results, it should be square.
From any page, click on "My Profile" in the upper right corner.
On your My Profile page, find the "Upload Avatar" field. Click the "Browse" button and locate the photo or illustration on your computer.
Then click "Update."
Scroll to the bottom of your My Page and click "Save."
NOTE: Your avatar may not show up immediately, so be patient.
Sassygrits (Copied from the HELP section of the board)