ChaiRX7

I have an 84 rx7 and the center piece on the steering wheel lost a screw somehow, or so my dad told me. The car is mine now and I need to disconnect the horn in order to fix it, otherwise the horn will blast if I try. My dad stuff a thick thing of paper under one end of the piece so that it stays, but I need to fix it cause its ridiculous. I'm somewhat a noob when it comes to cars so if this is an easy procedure, I just need someone to point me in the right direction. Thanks. Here is a crappy picture to show you what I mean.