Powering Headrest monitors in a Contour

I am trying to find the easiest way to do this. All I need to know is where can I draw the power from in my Ford Contour? That Add-a-circuit thing might work, but I dont understand how it works. I need help, fast! It took me too long to get the audiovox 5.6 tft lcd and to put it in my headrest, I want to power it up! Thanks people

.....and I joined the board just for this. If I get my problem solved, it will be reason enough for me to stay