Who in DFW can finish my brake controller install (connect 1 wire)

I bought the Redarc Towpro based on recommendations here. I got the install finished except the very last step. The last step said "Find the wires connected to the brake stop light switch at the top of the brake pedal. Test the wires to locate the wire that carries a signal only when the brake pedal is engaged. Connect the red wire using a quick splice wire connector".

I see a plug with 4 wires in it, but my back and should injuries just wont let me stay in that position long enough to do this step.

I'm looking to pay someone to do this for me n the DFW area. I can drive to you or your shop.

Any takers?

 

Sounds easy enough, I'll text you.

 

Per our phone conversation, check this fuse in the engine bay: