Ok.. I see that you need many more posts to have a signature, but I have over 500 posts and have been a member for ages, and yet I'm getting "you are not permitted to have a signature."...even though when I post, my old signature shows up. I can't edit it to show my current rig.
Ok...nevermind...as soon as I posted this, the ability to edit my signature came back. Maybe it's because of how long I was inactive...