Signature Help!!!

I need help with my signature, i made a signature pic but it does not seem to work when i click the "Insert/edit image" ill try to insert it right now, see it does that. Well if anyone of you guys can help me thanks!!!

Nope, don't see it.

EDIT: http://www.terrariaonline.com/threads/how-to-post-images-on-the-forum.42711/
and http://www.terrariaonline.com/threads/the-complete-guide-to-terraria-online-signatures.43621/

The URL of the image you're trying to insert is (http://www.terrariaonline.com/Terraria). Dafuq?

I LEARNED HOW TO DO IT!!! nevermind people THANKS TUNNEL KING FOR THE LINKS THEY HELPED!!!