you should look for a filler pipe just above the sump, has a cap seal on it, or you could have a filler plug on the transmisson, just make sure you undo the right plug, would suggest you get a haynes manual to show where it is, once you have filled trans with correct type/amount of fluid, you will need to strat the car, and keeping the brake on, go though the gears to allow fluid to settle.
helpful?, September 2010