1988 Toyota Corolla My horn on my steering wheel stopped wo

Hello, my 1988 Toyota Carolla has 240,000 miles and still runs great, but the horn stopped working. I had it fixed once, and it worked for a while, then it was on and off, then stopped working altogether. I want to take the part of the steering wheel apart that you push to make the horn work to see if something is not making contact but do not know how to get it apart. Also someone suggested checking the fuse, but the fuse box onder the dash has no horn fuse, is there one somewhere else? Thank you very much for your help.