put this set of symbols [] around the word img at the beginning of the url. then put the same symbols around /img at the end of the url. I would post an example of how it is supposed to look, but thenthe board would think i was trying to post a pic and give me an unrecognized format error, due to the fact that its not an actual pic. So try that. It should work.
OH you want to put it in your signature. Go under your user cp and go to your profile.
scott