My horn doesn't work, I don't know the order of these parts to go onto the steering wheel.Ok, I found where the clicking is come from. is this the horn relay?View attachment 303620
I haven't checked to see if it works that way, but I have torn into lots of them, and reassembled them with the ring being on top. It has always worked for me.plastic ring on bottom flat next then cup, when you push on cup presses flat on to horn stud grounding circuit

The square one should be the horn relay, the round one is the flasher.
The nylon screw retainer/ isolator goes through the cup piece and then the flat spring plate. The screws hold it all to the steering wheel.
If the relay is clicking, then I would check to see if power is making it to the horn wire. It's possible that the relay is not doing its job anymore, so check to see if it puts power to the wire. I would also check and see if the horn has a good ground through the mounting bolt. It is also possible that the horn itself is dead.
My bet is the horn is dead...run a hot wire from the battery positive to the terminal on the horn,if it does not honk or groan or make any noise then,its dead..I've had lots of Delco horns die,the road salt eats the innards up ..some I've gotten to work again after whacking it with a hammer or fiddling with the adjustment screw on them,but usually they die and that's that..
The fact the relay is clicking shows its working and the horn button is activating it..