Kriss Brake Flasher

Got another question for all you mechanical gurus. I bought a headlight modulator, and a brake light flasher from Kriss for my 2007 Nomad 1600. The headlight modulator seems very easy. My question is about the brake light flasher. Those of you who have installed one. How hard is it considering I'm no mechanical or electrical wiz ? Which wire is the lead wire to the bulb ? Where is a good spot to fasten the ground wire ? Thanks for any help you can offer.