Philips head screwdriver to remove 2 screws holding plastic grill above microwave door in place. Old Filter lifts out slide new filter in. It rests on an angle. Re insert Grill (careful that plastic tabs slide into proper slots). Tighten SCrews
Ordered a replacement grill, replaced the optional charcoal filter at the same time. Took just a little effort to get the alignment tabs in place--required just a little more elbow grease than you'd think, then replaced the two screws.
The filter we have is 6x4. I ordered by phone.They sent the wrong part - 6x11. We returned it to Post Office at our own cost - $8.85 May26. Tracked - it arrived May 28. So far we do not have the correct filter. We are waiting for the refund. Charged $49.99 plus tax & shipping of $7.75. Thank you for helping us get the correct filter and a refund. We should not be charged for returning the wrong part they sent us by mistake. Marilyn Tostado