How to unclasp: The ball is thick - please pull both ends of the bracelet inwards gently so that the ball will have a wider gap to unclasp easily. Unclasp both loops. Push the button to unlock and pull apart.
To secure: Push both ends of the bracelet in a bit so that the ball has more room to fit through the fastening. Clasp both loops to lock.
If the fastening is loose: Over time, the fastening might loosen with usage. To tighten the fastening again, grab a black bobby pin (make sure its not sharp or it will scratch) or you can simply use your fingers; hold the loop vertically and pinch together to make the gap of the loop smaller.
Please note that the button is purposely loose and it is part of the design so the ball and loop have room to maneuver and it is not the main fastening. The main fastening is the side loops to secure your bracelet / necklace properly.