There are 4 tabs that hold it in place. One on each top and bottom corner. Take something thin (you will scuff the aluminum looking sticker on the dash) and while pulling on the display press down on the tabs. It will allow it to release.
I first removed the 4 screws from the bezel, one in each corner, then the unit will come right out. The mounting adapter is held into the dash with 4 clips, 2 on top and 2 on the bottom. These are part of the adapter.