drain plug is on left side of the case below the trans oil temp sensor.
as for the fill plug, there isn't one, there is only the dip stick and the strainer underneath the plate for the dipstick. You should pull the strainer anyway and clean it so while you have it out add your fluid in at that point. You can try the dipstick hole but it is rather small and the fluid probably wouldn't want to go in very well.
It uses Dextron II atf and holds 10 liters (2.6 gal)
Add 2gal first Start the engine, let it run for a couple minutes at idle, then shut it off and check the level. Then add more if need be.