Keeth:
This may be a bit tricky without a picture, but here goes:
First get the tranny hot (I tried talkin dirty, but found that a good 10 mile drive worked better)
Get the car up on 4 jack stands ( I know its pain in the ***, but its really the right way, unless you have a lift) You want the car as close to level as you can get it.
Find and open the drain plug. As I recall its toward the back of the tranny at the very bottom. (you do have a drain pan under there with you, don't you?) Just like an engine oil change, give it time to really drip out.
The filler plug is on the driver's side about half way back and halfway up the side of the tranny. (It might help the draining if you opened the fill plug before opening the drain plug)
Now comes the fun part, getting 2 qts of really thick oil to flow into the filler hole. ( Oh yeah, put the drain plug back in!!) I did it from above (through the engine compartment) using a length of plastic tubing and a funnel. I had the benefit of my 14 yr old under the car holding the end of the tubing in the filler hole. Not too bad, a bit booooorrrrring waiting for it to drain.
This month's Alfa Owner had a short article by someone who made a pump gizmo to pump the oil in using a small air pump, a juice bottle and some tubing. I wouldn't begin to try to describe it.
When oil starts dribbling back out the fill hole, you're done. Screw the filler plug back in and get the car back on the ground.
If the car was leaning backwards when you did the filling, you will have overfilled the tranny and will now spend the next month smelling the excess burning off as it drips out onto a hot transmission. Ask me how I know!!! ( get it up in the air level)
Lastly, I don't think that MTL is the right choice. I used redline 75/90NS after asking around a lot ( including emailing redline). I am very happy with it in my gear box.
Good luck
John