Air conditioner service port

I recently bought a 2002 LSV8 sport and need to charge the air conditioning system. I cannot find the service port but i have been told it is under the car.

It is located on the back of the AC compressor. The AC compressor is located on bottom of the engine on the drivers side. Theres a small plastic cover partially blocking ccess to the port. You should be able to see the black plastic cap from under the car, just behind the accessory drive belt. It can't bee seen or accessed from the top.