there is a cover that pops out right under it ,looks like a vent kinda take that off then twist the pigtail out and there you go
Begin by removing the wiring harness from your third brake light. Remove the third brake light retaining screws. Reverse the process to install your new third brake light.
You already have a 3rd brake light behind the rear glass. Do you mean change the bulbs? If you do need to change the bulb then all you need to do is take off the paneling inside on the liftgate and you will have access to your lights.
the third brake light is direct from brake light switch no fuse
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The third brake light is named for then Secretary of Transportation Elizabeth Dole and are called "dole lights".
Chevelles never had a third brake light since the Chevelle name was dropped after 1977. However, third brake lights were first installed (and required) in 1986.
with a hammer
Check to see if the fuses are blown. Also it is possible that you have a broken wire leading to the third brake light. Lastly, it may be that your light has lost it's "ground" Any light must be grounded to the vehicle body to work. Make sure the light has a good ground.
A third brake light is used to provide a deceleration warning to vehicles that can't see the left and right lights. You can learn more about these brake lights at the Wikipedia.
New bulb needed or broken wire