Here is the page on posting avatars (which is the picture under your name)
http://www.yorkietalk.com/forums/pro...?do=editavatar
Avatars can be a maximum of 75 by 75 pixels and up to 18kb in file size (Donating Members can have a bigger avatar).
If you need to resize your picture, here is a link on that:
http://www.yorkietalk.com/forums/showthread.php?t=1994