The nav unit is in the trunk floor on the right side under a panel held by a couple of push-pins. I am working from memory, but as I recall the opening for the DVD is on the left side of the box. There are a couple of fasteners on that side that you loosen so the box can be tilted up enough to access the loading slot. Once you have access, trun the ignition key to the position that turns on the radio/nav, etc. There is a slide switch next to the slot that you move to eject the old dvd. Slide the new one in, reposition the unit and tighten the fasteners. Put the cover back in place and you are ready to go!
Thank you I found it no problem 10 minute deal. dealer wanted $100.00 to install after $275 to purchase. Brutal.