go to 'user cp' button (top of each page)
Then go to 'edit options'
scroll down to add/change avatar, 'Avatar' being the small pic in your profile.
this will give you a browse button, click this, locate your picture file, and double click it.
However, the picture file must be no more than 150 x 150 pixels in size and 100k file size.
then click 'submit modifications' at bottom of page.
if you don't have the software for reducing your chosen pic to this size, email the pic to me at email@example.com
and I'll do it for you.