Blasterman

Hi, I recently bought a 2005 model rx300 with the nav system and factory ICE system with rear headrest monitors. It may seem like a stupid question but I can't find where to insert the dvd's to play on the system. I found the Nav dvd player in the boot area and tried inserting them in the dash mounted 6 disc changer all to no avail. I've searched the car front to back and cannot find the dvd player that is illustrated in the instruction manual???? Can someone please help a poor old technophobe? Thanks in advance