The teal green Mirage Activa Cushion Clip is the part of the CPAP mask which connects the cushion to the frame. The cushion clip is inserted into the channel around the Mirage Activa cushion, and then the clip is snapped onto the mask frame.
To snap the cushion clip onto the Mirage Activa mask frame you should first insert the bottom tab of the clip into the notch in the bottom of the mask frame. Then simply push the clip and cushion toward the mask frame until the two larger tabs of the clip snap into place.
To remove the clip and cushion from the mask frame, squeeze the two upper tabs on the clip and push the clip away from the frame.
Note that this cushion clip is included with the Mirage Activa cushion.