1) Go to the menu at the top of this page, click on the User CP
2) Go to edit avatars and click.
3) Click on use custom avatars
4) Browse your files to find the picture you want to use
5) Click on save changes
6) It will add your pic to your posts automatically.
It is 20 posts for an Avatar and 50 posts for access to your profile, private messaging and a bigger signature.
It takes the software about an hour to update once you have reached your post count.