So recently I bought a 2013 Scion FR-S from someone, but when I brought it back to my house and testing the steering wheel horn and it didn't make any sound.
When I press the alarm button on my key fob it worked and I check the rely, fuse, and the wiring behind the steering wheel airbag.

I don't know what the problem, can anyone help me figure this out?

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The wiring is there but did you check for a short? You can try disconnecting and reconnecting the cable. You can also test the cable's continuity with a multi-meter.

Might want to disconnect your negative battery terminal before disconnecting and or reconnecting any electrical connection.

 

Nope didn't check for any short, but will now.