Before working with any part of the car's electrical system, it's always a good idea to disconnect the negative terminal on the battery. Loosen the connector with the 10mm socket wrench and move it out of the way where it won't accidentally come in contact with the terminal.

On the coupe, accessing the bulb is extremely easy. Along the interior lining of the trunk are small covers on both the driver and passenger side. Simply pull it up and out to access the tail light assembly.

You'll see three different bulbs making up the tail light assembly. A) is the tail/brake light; B) is the turn signal light; C) is the reverse/back-up light.

The brake/tail light bulb is the outermost of the three. Simply twist it counterclockwise and you can pull the assembly out.

For reference, I'm looking at the passenger side in this picture.

Pull the bulb towards you and remove it by rotating it counterclockwise and pulling it out of the socket. Take note of which filament in the bulb is "up" before you remove it (you won't be able to properly seat the bulb incorrectly, but this just makes it easier). After you remove the old bulb, put it somewhere apart from your replacements so you don't confuse the two.

Now we just work backwards. The new bulb has two small nubs near the base that align to grooves in the socket. Insert it and twist it clockwise to ensure it's nice and snug. If you took note of the orientation of the filaments and replaced it the same way, you shouldn't have to struggle at all - otherwise, turn it 180 and insert it the other way.

Insert the new bulb assembly into the tail light socket and turn it clockwise to ensure it's properly seated. Provided you didn't disconnect or move any wires, you're almost done! Replace the small cover in the lining and reconnect the negative battery terminal.