Switch off the circuit breaker that controls power to the GE JVM1750. Because the appliance is wall-mounted, cutting the power at the breaker is easier than reaching the microwave power plug.
Take out the two screws on the top edge of the appliance above the grill.
Slide the grill to the left and pull off the microwave.
Remove the old filter from the compartment behind the grill and replace with the new filter in the same orientation.
Push the grill into position and slide it to the right.
Secure the grill to the top of the appliance with the two screws. You can now turn on the power at the circuit breaker.