I had the same problem with my signature, but one of the members told me the solution. When you edit your signature, there's a button that will allow you to view the source code. When you do that, you'll see the string of characters that represent a line break. It's a "less than sign", followed by the letters "br /" (note there is a space between the "r" and the "/"), followed by a "greater than sign". Insert those 6 characters wherever you want it to break to the next line.
Oh yes, nice job on the chicken!