Trouble with Signature Images

Hi!

I'm relatively new to the bump, and just started posting to the TTC message board.

I'm having a lot of trouble trying to get my signature image to work.  I understand how to add a one-time posting image, but I want to learn how to put in my profile signature so it'll come up every time I post.

I looked in the FAQs and learned what to do, but it's still showing up as a broken link. 

Can anyone help?

Thanks!