The AC system on a 2001 Pontiac Grand Am, like most vehicles, doesn't have a place you "charge" it yourself in the way you might charge a phone. The AC system uses refrigerant (R-134a in most 2001 Grand Ams) that needs to be added by a qualified technician using specialized equipment. There are
two ports located on the car's AC system, usually low and high-pressure ports, but attempting to charge it yourself is dangerous and can cause further damage to the system.
To recharge the AC, you need to take your 2001 Pontiac Grand Am to a qualified mechanic or an auto AC specialist. They have the necessary equipment and expertise to properly diagnose the problem, evacuate any old refrigerant, add the correct amount of new refrigerant and oil, and check for leaks.