Buy honda ATF, for automatics you need 2.9 quarts. Drive the car for a little bit to get the fluid hot to help remove sediment and junk from the transmission. Put the car on jackstands, and their is a drain plug on the transmission. Loosen and take out that bolt, let the fluid drain completely into a container, and then but the drain plug bolt back in. Lower the car, and new transmission fluid in through the dipstick hole in the engine compartment. Start up the vehicle, and shift it through all the gears, (without driving anywhere). Turn the car off, and recheck the fluid level on the dipstick, add fluid if necessary to bring the fluid level up the crosshatched marks on the dipstick.