The very center of the horn ring pops out and there is a single nut that holds the steering wheel to the shaft, and 3 screws holding the horn ring. The picture below shows the main nut removed as I was going back together with the whole mess.
Make sure you don't loose this:
Or this:
After removing these items, you will find the threaded bolt holes to attach your puller to:
Make sure to remove the horn actuator button and the little spring inside before you pull the steering wheel off.