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How to add R134a to my van on 1993 Chevrolet G Series Van (G20)

Enthusiast 01be16a5a93688912f14755221fb15211b518d9a788cf01b455e03cc1bd585ac
How do I identify the low pressure port ? Any other tips would be greatly appreciated. The a/c works, it's just getting weak. It has probably been 6-7 years since it was serviced last.
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If your using a can of refrigerant from a auto parts store the fitting is designed to only fit the low pressure port, be careful not to overfill.
here's a site that has instructions for recharging your system http://www.ehow.com/how_2081698_add-freon-car-air-conditioner.html the fitting on the can only fits the low port
The auto store recharge kit did not fit the nipple with black cap. There is another one sticking out of the evaporator ??? canister that has no cap. Totally uncovered. Might that be it ???