For easiest application, turn the furniture turned upside down. Press the ball on to the leg, the flaps should go down into the ball. You can leave any old pads/caps on the leg as long as they fit into the ball. If needed, you can cut up the ball a little extra with for example a carpet knife.
OUTSIDE (furn.leg)
INSIDE (furn.leg)
ON-TOP (furn.leg)