I'm stupid so cut me some slack and bear with it, how exactly do you post any kind of graphic online? More specifically here...
Go here http://vgchat.com/showthread.php?t=1810 and then pick a host. Upload your picture. Than get the link and put the img tags which are [img] (do not include this message but that tag goes in the beginning and) [/img] which goes in the end.
Example: If the link to my banner is [url]www.photobucket.com/name/vgchat.jpg[/url] I would add the img tags to it so it would be.... [img]www.photobucket.com/name/vgchat.jpg[/img]
Now.. If you wanted to make it as your signature, you would have to go to...usercp--->edit signature----> than you post the link in there with the img tags on it.
http://www.h22s.com/imghost/
Just hit browse, find your image, hit upload, and copy the text. :)
[img]http://www.h22s.com/imghost/uploads/IheartMoogle.PNG[/img]
I did it just for you, Hsevenper.