A fixture is what the light bulb goes into.

The correct spelling for a fancy light fixture is "chandelier."

The light is wired the same as any voltage fixture. Bring the source voltage to the fixture and connect it to the two fixture wires. If you want to control the off-on of the fixture take the source voltage to a switch first and then out of the switch to the light fixture.

Take the nut off at the bottom of the light fixture by unscrewing it.

Disconnect the fixture wires and remove the central mounting nut to release the dome from the light fixture in a ceiling fan.