they should just press into plastic clips. I believe the ones that screw in you can see the screws. Don't pry up on the edge it will chip your paint. I use a tool from Home Depot. It is like an awl only the last 3/4 inch is bent 90 deg. I insert the point through the grill near the end past the bend, turn it so the blade is perpendicular to the grilles and lift.
Good luck
Gary #06984
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