It looks like I can change the text in your signature, but images are not working.
You changed the text , but when I try all I get is
You have included 0 images in your message. You are limited to using -1 images so please go back and correct the problem and then continue again.
Images include use of smilies, the BB code [img] tag and HTML <img> tags. The use of these is all subject to them being enabled by the administrator.
Your signature cannot be longer than -1 characters including BB code markup.
How do you make a ninja cry?
Smack him in the nuts.