- go to "your controls", under the banner
- click on "Edit Avatar Settings" under "Personal Profile"
- click on the "Browse" button next to the "Upload a new image from your computer" option.
- select the image file from it's location
- click upload
alternatively you can go to this site >>>
www.imageshack.us and upload it from there. Get the link address and enter it under "Enter a URL to an online avatar image" from your controls.