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The button itself you are supposed to be able to just pull it off,Ive had to pry them off on occasion.
I discovered the hard way, it's better to stick a flat blade screwdriver in there as far as it will go and give it a twist. You can pull the retaining ring straight off the emblem if the upper horn contact is tight.
Of course, I pulled mine off at least 10 times before I ripped the horn cap off of the retaining ring.
You have to angle the blade up a little bit to get it above the telescoping ring, then gently push it in as far as it'll go and give it a twist. I used a 3/8" blade screwdriver.