Basically all you have to do is rate the signature above you, on the scale of 1-10. 1 being very bad, and 10 being excellent. You can also put comments regarding the signature too. AND you can post more than once.
Like say you already rated someones, you can rate another person's, later as well. I think this should be a fun game! The signature doesnt have to be made by you, basically its a rating on how well your signature is.