Pop the center cap off by gently prying the edge where it it meets chrome horn shroud (the chome bar you push to honk the horn) and remove the cap. You can use a find screwdriver or if you have a good grip and some fingernails you can sometimes just pry it off with your fingers. It will expose a locking nut that secure the horn shroud to the steering column.
Here is a picture with arrow pointing to area you need to pry up to remove the center cap:
If the nut is tight and the shroud is still wobbly, then the screws that hold the horn contact cartidge to the bottom side of the shroud have probably come loose or the horn contact is damaged and coming apart. To remove the shroud and access the horn contact, remove that large nut with a deep socket. Then, remove the shroud and flip it over and you will see 3 Phillips screws that holds it to the bottom of the shroud. If screws are loose, simply tighten. If any are missing, you need to replace (I have them). If the horn cartidge is comeing apart I also have them.
Here is a picture of the tilt column horn contact for reference:
Jason Edge, thank you for this detail. I was able to figure out that the "Nut" was actually loose. I tightened the nut and the horn works again, but only when depressed to the left side. I will dig a little further this weekend.