Push down the round center, it will depress and allow you to take the clips out without breaking them. I used a thin plastic paint scraper type thing to pry them up gently around the sides till I could pull them out. When they are out, pop the centers out (push up through the bottom) so you have two pieces and then stick the large outside piece in when you're ready to put it all back together and the center "pin" will lock it in place.