I just bought a Icon DVD player. It has 3 wires. 2 power wires and a ground. One of the powers is constant for DVD memory and the other is turns on with the ignition.

Where should I tap these wires into.

 

Fuse box - get the "add a circuit" units from like autozone. they are about $10 each - you would need two - one for a FUSE which is switched with the ignition and another for a constant power... the ground you can just screw into the frame of the car - or at any point which there are other grounded wires.