You have two drain plugs one is at buttom of trans oil pan other one is at convertor first drain trans fluid from trans pan next use a screwdriver turn convertor from the window ( front of trans oil pan) until you can see the plug drain convertor oil,remove six bolts & oil pan now you can change filter three screws,clean oil pan reinstall pan with new pan gasket never over tight the six bolts it will damage the oil pan,refill trans fluid from under the hood put 4q first then start your engine add other 2q and check again add more if need. hope this help

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MB STARS Master Guild Technician,17 years MB tech
14 years independent shop owner