To use it, simply take of the mouthpiece to reveal the cartridge or “tank” connected to the vapor pen’s battery portion. There is a small wick surrounded by a metal coil at the bottom. This is the heating element where you place the oil/concentrate. Take a small amount of oil/wax, place it in the tank with the heating element, replace the cap then press the button 5 times to turn on the pen, the press and hold to engage the heating element. Not only is the Micro G extremely easy to use, it produces massive vapor hits.