if your talking about the atf (automatic transmission fluid) for the power steering then it should be a little black tank in the engine bay which on my 97 el falcon says power steering on the cap. have a good look in your engine bay and you will see it.
If your talking about gearbox fluid then the filler plug should be above the drain plug on the gearbox. it should be relatively obvious if you can get underneath the car, but is sometimes difficult because of the position to fill. at work ive got an atf drum with a hose and hand pump for such tricky areas
Lloyd
May 2009