Hi I'm new here, I hope this is the right place to post this. I picked up my Gand Vitara today

and I noticed it has "Compact Disc Auto Changer Control" written on the front of the CD player in the car. But I can't find how to put CDs in or if there is a cartridge in the car anywhere? I've checked under the passenger seat in the cubby tray thing.
Is there something I'm missing? Or what do i need to do/get to make the cd changer work?
The CD player is a Clarion factory fitted one. It's a 2005 Gand Vitara, if that helps
I am clueless when it comes to cars and everything to do with them, so please don't use too much car tech jargon, I won't understand it.
Thank you
