I know this is late, but hopefully it’ll help someone in the future.  You remove the screws, then wedge a credit card  between the plates and frame.  Slowly twist the card until the plate pops off.  The plates can be popped back in, but I don’t think you can do it many times before the plastic rivets break or wear down to the point of being useless.  I’d do it maybe 2-3 times tops.