Cross your right foot behind your left leg. Your right ankle should fit into the crook behind your left knee.
Bend your left knee to drop down. Turn your right foot so that you land on the toes of your right foot. Avoid letting your left knee hit the ground.
Keep both feet on the ground as you spring back up and spin to your right to unwind your legs. Turn your left foot on its side as you spin up instead of keeping in flat on the ground. End the move with both feet flat on the ground and standing straight with your feet together.
Perform variations of the pin drop move by altering the "dropping" motion to make it more complex. For example, instead of spinning out of the move, stand halfway up and switch legs so your left foot is behind your right knee. Continue the move by spinning up in the opposite direction.