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Which valve do I add freon to upper or lower? on 1999 Cadillac Catera

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Need to add freon . There are two ports, one on top nearer passenger Compartment and one lower nearer to radiator. Which do I use.
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I would not add any refrigerant if you are not familiar with a/c systems, take to a shop with the correct special equipment to do the job correctly, you can't just FIX a/c by JUST adding refrigerant.
Well, freon can certainly be added if the system is low and fix the cooling problem if that's what the problem is.