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Attach the power wires. Attach the ground wire. Secure the wires. Install the mounting bracket and/or mounting screws. Hang the light. Install a bulb. Turn the power back on. Complete installation.
Have an assistant hold the light fixture up to the ceiling while you connect the wires from the light fixture to those hanging out of the junction box.  Connect wires according to the directions provided with the light. Usually, this means connecting black to black and white to white. Wrap the exposed ends of the wires together.  If there is not enough exposed surface on each wire, you may need to use wire strippers to peel back some of the wire insulation.  Screw on wire nuts/connectors to cover the exposed connections and secure them tightly. These should be provided with the fixture, but if not, can be purchased cheaply at any hardware store. Find the ground wire on the pendant light. Depending on your wiring, you'll either wrap it around a ground screw located in the junction box or attach it to a protruding ground wire.   The ground wire is usually either a green wire or a bare copper wire.  If you have a ground screw, tighten the screw to hold the wire in place. Push or fold the wiring up into the junction box, making sure that all wires remain secured together with the wire nuts. Your new fixture should have come with a bracket and/or mounting screws needed to firmly attach the pendant light to the junction box. This will vary depending on the style of light you are installing. Follow the manufacturers instructions. Attach the canopy of or base of your light to the mounting screws or bracket. This process will also vary depending on the style of pendant light you are installing, so it's a good idea to check your directions before you start.  In some cases, the process is as aligning your mounting screws with some small holes in the fixture, and turning the fixture about a quarter turn. In other cases, you'll have to screw the fixture into a mounting bracket. Screw a light bulb of the correct voltage and size into the pendant light fixture. Your light should now be functional. If your light does not function, turn the power back off and check your wiring. If your fixture has a trim, a cover, or any other remaining parts that still need to be installed, install them now, and make any final adjustments to the light's height.