I will try my best to answer all of your questions.
However, before we get started, please let me mention a few things.
1. If at any point you would like to speak on the phone, please feel free to request a phone call on your end and I can call you right away.
2. If you dont understand any technical terms or anything that I mention (component tests or theory or operation), please let me know and I will provide you with a more in debt explanation or answer.
3. Please understand that I am here to help you anyway I can.
Start by checking the 15 amp horn fuse in the central junction box. If this checks out good, be sure the horn relay is good and has two powers going to it. If so, then it could be a faulty horn pad in the steering wheel and or a wiring issue to or from the horn or relay (or possibly a bad horn)
The clicking you are hearing is likley the relay working. This means there is most likley power down at the horn and the horn is bad and will need to be replaced.