How to play music from my iPhone in my car? - 2

My new car has a cord coming out from under the dash by the steering wheel to connect an iPod/iPhone to play music through the speakers in the car. My best friend bought a truck a while ago with this, but his had a switch with it and a specific station the radio had to be on to use it. I can't find a switch and I don't know which station to use. The previous owner of the car (which had it installed) had died and his wife knows nothing about the car. Does anyone know how I can figure out how to get it to work?

Added (1). The equipment is already in my car I'm just not sure how to use it.

Buy a car deck

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