The transmission drain plug location on a 2006 Chevy Malibu SS is
not easily accessible without removing the transmission pan. There isn't an external drain plug like on some engines. To drain the transmission fluid, you will need to remove the transmission pan itself. This requires jacking up the car, supporting it securely, and having the correct tools.
Caution: Working on a transmission is a more advanced repair task. If you're not comfortable with this level of car maintenance, it's best to take your Malibu to a qualified mechanic. Improperly performing this task can damage your transmission.