You cannot access it from the inside. You need to use a small falt bladed screwdriver and a towel. Gently pry up on the roundel and work your way around it lifting a little at a time. You must replace the grommets with new ones as the old ones usually will not hold the new roundel. Clean the area, apply wax if desired, install the new grommets and then line up the new roundel...gently pushing down on it with your palm working it into the grommets