Step 1: When you are at any section of the forums, you will see the link bar at the top underneath the banner. You must click on it like so:
Step 2: Now you have reached your control panel. To your left there will be a lot of choices you can make, but for now just click on "Edit Avatar" underneath "Settings and Options". This can be seen here:
Step 3: You will now reach this screen:
There's a lot of choices about what you can do for an avatar. You can:
1. Choose not to have one
2. Choose an avatar from the site or your filemanager("Get Doll") or link to one from an image you uploaded to a service like photobucket.com or imageshack.com
3. Choose an image from your files on your computer.
Keep in mind that there is a limit on the size when choosing a picture. Once you choose, just click "Save Changes".