each side of the grill has two '*poo* clips'... plastic clips at the top, take those two out. then there is about 3 points along the bottom curve where each grill is clipped in. u need stick your hand in to the inside and try and un hook them. Hard to describe without pics...but i change my grills to black mesh.
Yeah Slee96, its difficult to remove the grille without removing the bumper first. With our one-piece grilles, there are 4 plastic looking clip screws at the top and also another 4 on the inside.