Yuo must fill it through the LOW SIDE service port. I cannot tell you EXACTLY where to find it because the locations are different from model to model, year to year and engine size to engine size. You will have to identify the low side line and locate the port.
There are very good videos on this subject at the interdynamics web site. They show how to identify the fittings and how to go about charging the system. Just click the direct link below to go to the site.
Interdynamics Instructional Videos
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