1.Choose the right needle holder: Loosen the holder to have the right one one. Check which needle cartridge for tattoo needle holder or pmu needle holder you will use. 2.Connect the hand piece: Connect the hand piece to YD BLINK by connect cord which can be connected to socket. 3.Inserting the needle cartridge into the hand piece: Hold the hand piece with the insertion opening facing upwards. Screw the needle cartridge into the handpiece. 4.Turn the power on: With all the steps before mentioned completed, you can now turn on the control unit. 5.Adjust stoke Length: On the circle part inside the pen, it can adjust the stroke length. For Tattoo, it should be 2.7mm. For Eyebrows, 2.6mm is recommended. For lips, 2.4mm is better for delicate lip tattoo. 6.Adjust penetration depth: By turning the adjustment ring on the handpiece to the right, the penetration depth can be increased.