After you've installed the Base, return to your circuit breaker or fuse box and turn ON the power.
If the Brilliant is installed properly, the light should turn on. Press the mechanical, circular button in the center of the Base to the turn the light off. If the light does not turn of with the button, do not install the Faceplate. Instead, turn the breaker off, remove the screws, and re-check all of the connections.