How do you add transmission fluid in a 1988 S10?

Raise and support the front of the truck. Place a drain pan underneath and remove the transmission pan bolts from front and sides and loosen rear bolts. Carefully pry front of pan down to allow partial drain. Remove pan and filter, clean gasket mounting surfaces. Replace gasket, filter and pan, tightening bolts to eight foot pounds. Refill Transmission Fluid to fill marks on dipstick.