Recharge air conditioner on 1996 Geo Tracker

Where is the recharge port for the air conditoner, I can only find one with an H on it near the radiator.

Asked by for the 1996 Geo Tracker
The low side port is located on the a/c line between the outlet of the evaporator (the large a/c line coming out of the firewall) and the a/c compressor.