Turn off the electricity for the Samsung at the circuit breaker panel.
Remove the screws on the top of the grille in the front of the appliance.
Slide the grille slightly to the left to disengage the part and lift off the appliance.
Install the new filter into the rectangular opening on the front edge of the microwave. The filter sits at an angle with the front edge turned down and the back edge resting on two tabs inside the microwave.
Place the grille on the microwave and slide it to the right to lock it in place.
Secure the grille with the screws, tightening each into the top of the Samsung.