Finally, we can finish hooking up our outlet.
Cut a short length of the correct-color wire and strip a bit off each end. A pair of electrician’s pliers make it easy to cut, strip and bend wires. By experimenting you’ll figure the right amount to strip, so that you don’t leave exposed wires inside the box.
Bend the wire and attach one end to the screw on the receptacle. Always attach it clockwise; if you don’t, the wire may slip off as you tighten the screw. Join the other end of the wire to the incoming and outgoing wire of the same color.
There are various ways of joining the wires, but a plastic wire connector is one of the easiest. The box tells you how many wires it can connect, and how to use it. With most, you simply twist the wires together, and twist the connector tightly over them.
Attach one of the incoming grounds to the ground screw at the back of the outlet box, leaving enough wire to then pigtail it to the other ground and the receptacle. You can also attach a separate wire to the outlet ground screw and pigtail all four grounds together.
Ta da. Now turn the power back on and see if it works.