1. Turn the upper cover to the right.
2. Fill the tank with tap water up to the max fill line and add 3-5 drops of the essential oil.
3. Replace the upper cover and make sure it is well closed.
4. Press the power button: 1st press: it works for 2 minutes and stops. 2nd press: it works for 2 minutes, stops for 2 minutes and then the diffusion cycle starts again. 3rd press: it stops.
While the humidifier is working, a blue light is on.