on the bottom right hand side of this page is something called 'forum jump'.
select user control panel from the dropdown menu.
click on go.
on the lefthand side of the page is the 'user control panel'.
go to 'your control panel'.
under 'settings & options' select 'edit avatar'.
here you can select from pre-defined team avatars or a custom avatar.
if you want a custom avatar, by going to 'option 2 - upload image from your computer',
click on browse and then enter the filename on your device to be uploaded into 'choose file to upload' window.