MP3DUB

Hey there,
I'm rather new to car computing. I had a friend of mine help me hook up my first, POS install. I mean its not terrible but it needs to be upgraded badly. However, my friend lives in CA. I was hoping maybe you could help me out by answering a few questions for me or maybe we could meet up sometime and go to town. I'd say the biggest problem im facing at this point is the start up and shut down. I was using a relay before on a laptop, but my friend is the one who handled all that part. I'm trying to do the same for my desktop i wanna put in there but i dont know where to attach the wires for the relay considering there are 4 wires going to my power button on the comp. 2 yellow 2 black.