How do you take the back panel where the speakers are off

Hi amyla! I couldn't find a reference for this on the web but I imagine that there's a breakdown of the procedure in the Chilton's manual for your Monte Carlo. I further imagine that there's a copy of your Chilton's on the shelf of your local library. You may get luck and get a guide for the cost of a couple of 25-cent copies! If not try your local book store or parts place. Monte Carlo Chilton's should be easy to come by. Good luck!