how do you apply a pic to your own avatar?

[spawn]

Thx for the help Greg & Christy. We have a mac. I managed to resize the image last night on photo-bucket, but then it looked kinda crappy. I'll give it another look this eve & see what I can figure out. I just don't get it why its seems to be such a different process than just posting a regular pic. It keeps saying invalid url or something I cant remember exactly what it said, but it was something like that.