How do I add my own buddy icons/avatars in Aim?

I currently use Aim Triton or Aim Version 6.0. I want to have my own picture as my avatar. Does anyone know what size or what format the picture has to be in? Also what do i do after to add the avatar?
I tried doing browse and adding it but whenever i add it, it always shows on my screen but not my buddies. Am i doing something wrong or is it just Aim.

on the botton you will see Expressions