It on the passenger side. The metal/aluminum lines that run somewhere by the passenger motor mount there is a line with a black cap. All you do is get a screw driver, take off the cap, and release the gas. There is a release / charge valve there, press on it with a screw driver. Be sure you do it in a ventilated area, and you cover the hand holding the screw driver in a glove or rag. Wear some eye protection. Then get a gauge and measure that you have proper operating pressure.