Guenapig, copy the whole link including the IMG with the brackets, paste it in your signature box, take out just the RED * from both the first and last IMG. Make sure the IMG is in the beginning and end of the link. Then hit save.
I was trying to paste his (Guenapig's) signature in my signature box, but I have too many signature characters in there to load it. So then I tried doing it in a post.