You'll need something thin like a spatula but only as wide as the base of the headrest that goes inside the seat. There is a button that needs to be depressed to pull the headrest out. The thin metal will cover the hole and the button will not be allowed to slide into the hole. I found that it was somewhat easier to slide the head rest fully out and then slide the metal in till you feel the button. Then push the head rest down along with the metal strip. Then hold the metal in place and pull up on the head rest. Good luck!
