ECMlink Rolling Anti-lag off horn button

[jakk220]

So I wanted to set up rolling Anti-lag on my car and would like to use the left side horn button to do so if it's possible. I'm not the greatest with wiring and just wanted to see if this is possible. I imagine it is, but am unsure of some things like if I would wire it in before or after the relay, and where would be the easiest place to tap into the wires. If it's not possible, then I'll just wire it into a separate button.

I saw a guy used the wiper spray function on the car to set it up and it just gave me the idea to use the horn since I have the stock steering wheel and my horn doesn't work anyways. Thanks in advance!