Article: Attach your footswitch to the the power supply. The footswitch activates and regulates the power from the power supply to the needle, similar to a sewing peddle. There is a clear location at the bottom of the machine for the clip cord to connect the machine to the power supply. There should only be 2 inputs on the power supply itself. Make sure you connect the cables in their proper location. Once everything is connected and assembled, you're ready to test the machine. If you are worried about testing the tattoo machine on yourself, just turn everything on and examine it. The needle should vibrate at a consistent speed (without stopping) upon pressing the footswitch. A good way to practice your art is by practicing on apples or pears. The skin on apples and pears are similar to the human flesh. If your fruits become damaged, then you're puncturing the needle too deep.
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Connect your footswitch. Connect the machine to the power supply. Test the machine. Practice on fruit.