how do charge ac on 1999 ml430? high side or low side? and where is it located? on 1999 Mercedes-Benz ML430

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how do you charge ac ml 430 1999
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here is some info on your system, do you have A/C experience? Do you have the vacuum pump to evacuate the system and the gauges to do the re-fill correctly? You may be low on freon, because there is a leak in the system. These are some things to consider.
i had a friend charge my ac from the "hi' side and it worked temporarly. i was later told that the 'low' side is where its suppose 2b charged. Which is true? Hi side or low side? its a 1999 mercedes ml430.