If you want the signatures to work, either N-Gin, go to your Profile and click a box to confirm you wish to show your signature in all posts, or one of the Administrators here shall need to open up your account information and do it for you.
Nice forum by the way, nice work Melon
I think an idea to have a general sig/graphics shop that doesn't fully relate to Spore would be a good idea. It gives the users a chance to practise other things and help each other out with anything. Also makes it less restricted, but these shops should be controlled and minimal.
EDIT: Here's a picture on how to get the signatures...[removed by author - page stretch]EDIT: One of the admins has disabled signatures, or forgotten to allow them.