Firstly you must upload a photograph to the internet, either to your own personal web site or to an image hosting site such as ImageShackSteve, How do I put my photo into my User Web Board Forum Index profile? I don't know what Avatar is but I think it is cartoons. I want to use my photo.
The width can be no greater than 80 pixels, the height no greater than 80 pixels, and the file size no more than 6 KB. For Photographs JPG is the best format, for other images such as cartoons - use GIF.
Next click your Profile Button
Scroll down to the bottom of the page and then enter the link to your picture - termed an avatar.