You talking about the cruise control buttons? It has dropped back from the cover?
The horn cover on S13 just has 6 metal clips. Just pull each corner towards you and they will pop out. Just not too hard or at a bad angle (the plastic can break that holds the clips in).
There are a couple wires connected to the horn/cruise control that will be attached when you pull it off.
The cruise button is just screwed in on the backside with 2 screws, the may have fell out.
Here's an article I did, the pics will show you were the clips are and how everything is attached.
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