Place the three middle fingers on the inside of your wrist with the tip of the third finger on the wrist crease. 

The Nei-Kuan point is located just below the tip of your index finger between the two central tendons.

Place the button face down on the Nei-Kuan point. Repeat the process on the other hand.

A wristband should be worn on each wrist. You can wear them before starting your journey or after your departure.