Note: This guide assumes that you are replacing the bulb on the driver's side. The steps are similar for the passenger's side.
1. Open the trunk of your car.
2. Locate the trunk lid release lever. It is located on the inside of the trunk, near the center.
3. Pull the trunk lid release lever and open the trunk lid.
4. Locate the brake light assembly. It is located on the inside of the trunk lid, on the side that you are replacing the bulb.
5. Turn the brake light assembly counterclockwise to remove it.
6. Remove the old bulb from the brake light assembly.
7. Insert the new bulb into the brake light assembly.
8. Turn the brake light assembly clockwise to reinstall it.
9. Close the trunk lid.
10. Test the brake lights to make sure they are working properly.