2002 Honda Civic Cassette player?

So I just bought an 02 Honda and it has a stock tape player. I'm still trying to figure why the hell there isn't a cd unit INSIDE the car. But when I opened the trunk there was a 6 disc cd changer. Is there a way to control which CDs are playing without having to switch them around in the trunk? I literally have no idea how to work the damn thing.

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