The magnetic clip lets you click the brace into your shoe without bending down. It replaces the standard clip and works with every XTERN model.
Back out both screws with the hex key and lift the old clip off the shoe. Keep the screws in case you want to switch back.
Set the magnet base over the existing holes with the flat edge towards the heel.
Drive both screws until snug, then give each a final quarter turn.
Click the brace in, then lift your heel. It should hold while walking and release with a firm pull.