1966 Barracuda taillight bulb

Open rear deck lid gently pull on bulb socket of if coroded pry out. If your asking about center backup light the red portion is just a reflector, clean up contacts. Go to welcome section and introduce yourself with pictures, lots of great people on site who can answer all your questions
Thanks for your reply. I'm a novice at this and I don't fully understand your directions. I'm not sure where the rear deck lid is. Is this done from inside the trunk. Thanks again.