Carefully pull the back plate off the camera

There are 2 ribbon cables that need to be disconnected from the main board to free the rear panel from the camera.

To release the cables by flipping up the tap on the side away from the cable

When reconnecting the cables, make sure the cables are fully seated before flipping the latch back down.

The black cable goes to the LCD (on the tilt screen), the other one goes to the buttons.

The black LCD cable does have less slack, so is easier to release first, and reconnect last.