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The low pressure valve is down by the AC Compressor. It is part of the aluminum manifold that connects directly to the AC compressor. It is accessible from above, but easier to reach from under the car.
By the way, is there any particular reason why you want to recharge your AC system? If it isn't working, adding refrigerant will not necessarily fix the problem. If the refrigerant has all leaked out, you probably need to evacuate the system first.
You take your car to the nearest licensed automotive A/C shop and have them evacuate the system and recharge.
I'm saying this because once you have opened the system, you have let moisture into it. Even a small amount of moisture will damage your A/C system, and needs to be removed. Also, they will know just how much refrigerant to put into the system once it is moisture free.