Remove the screw from the battery plate

Optional, but will make the next step easier: Detach the left cable by pulling on the blue plastic tab.

Optional: Remove the right cable with your hand (no plastic tab here, so make sure you don't damage the cord)

Then, carefully lift the board out of place. Be aware that there is a light LED (not present in picture) in the green circle that you might have to reposition when reassembling

The board is partly held in place by two plastic rods that are mounted in a hole around the blue circles. These are completely loose and can be pulled straight up