Place a tee in the end of the grip, leave an inch or so exposed. Go ahead and address the ball with your normal grip. Take the club back in slow motion and begin your wrist action so that the tee points at the ball as you approach waist height. At that moment you will see and feel the wrist movement as natural as can be, and when combined with the arms continue on to the end of the backswing.
Now begin your forward swing, at which time you will begin to feel as if you are returning the hands to the starting position right about the time you would make contact with the ball...then as you proceed forward in the swing roll your hands so that the tee once again points at the ball when you reach waist height. It's the reverse of the backswing, plain and simple.
You'll find out very quickly that the proper wrist rotation will add speed and flexibiltiy to your swing. The hands are the only part of your body touching the club and have to be relaxed and pliable.
Go hit balls....slowly..... to learn the above movement. However, breaking 100 will occur faster if you spend 2X of your range time chipping and putting.
Have at it!