Ok Sturgio, let me see if I can help.

First - Get the picture out from under your computer and get it loaded ONTO it. (just a little joke there )

Second - Upload the picture here to this site using the picture uploader link. (pretty easy so far huh?)

After it's stored here, copy the URL of the photo (right click copy, or press the Ctrl + C keys simultaneously) It's the white box on your browser that says Address.

Paste the URL into the select avatar field (right click paste or Ctrl + V) Hit update profile and you should be good to go.

I hope this helps.