While holding your fin in your hands, open the heelpiece to tension the elastic (1).
Put the fin on the ground and use your foot to hold it firm. (2).
Slide your free foot all the way into the fin (3).
Once your foot is firmly inside your fin, raise the tip slightly and gently push down with your heel to allow the heelpiece to raise automatically (4).
Repeat steps 1 to 3 with your other foot. (5).
To remove your fins in water, lower the heelpiece with your hand (6) and push your fin forwards.
You will find that the heelpiece is great in overcoming the suction effect between your feet and the inside of the fin when you are in the water (7).