I have all hot wires for the player going to the fuse box

But the means I have to turn it off by hand

what wire on the ingtion can i tire into that will cut it off and on with key?

 

just take a voltmeter and probe the fuse box, looking for a circuit that is hot only when the key is on, then tap into that circuit.

 

Like Poison said, you can poke around for a hot switched circuit like wipers or heater or whatever and you will get power to make your machine work. That is the Toothless Jake approach.
Better, find out where the ACC point off the ignition switch is, tap in, put in the proper fuse to supply your machine, and away you go.
The problem with tapping into any hot switched wire is that you may overload the fuse that is designed for only for the fed appliance, like lights or heater. You must be aware of the current draw of the CD player that you are installing. Otherwise, blown fuses.
Poke around with a voltmeter as Poison says, and report back. We will help you.

Semper Fi