does anyone know

1. Save the picture you want (you can take it from anywhere on the internet or even scan one) on your PC in a folder like "My Pictures" (for example)
2. Make sure that the picture is .gif or .jpg and is max. 40KB or it will not load.
3. Go to Settings and click on Edit Profile
4. Click on Upload Avatar and a small box pops up
5. Click on Browse
6. Go to "My Pictures" and click on the picture u want
7. Click OK in the small box
8. It might take some time to upload depending on the speed of ur computer
9. Once the picture uploads, it will appear in the small screen in the Avatar section
10. Click Update Profile

That is what Mystica said.

Hope it helps.