To turn the Smono 3 vape on, press the power button 5 times in quick succession. You will know it's on because the Smono logo will light up. The two LEDs in the mouthpiece will let you know when it's ready to use by turning from red to green. The green light lets you know that it's up to temperature. Fill the glass chamber and place it back into the device. Once it turns green inhale from the mouthpiece.