Where do you put the transmission oil in a 1997 Toyota Tercel 5 speed manual?

There is a plug toward the frt on the tranny, best way to get at it is from under the car. Also there is a drain plug on the bottom of the tranny. fill the tranny with 80w-90 rear end fluid up to the fill plug, if too much is put in, let it drain out of the fill hole until it stops, car will have to level. Can't seem to remember how much though??.....