You will have to remove the transmission pan, it is retained by 13-14 bolts. Remove all but the front or rear bolts, whichever is easier, and tilt the pan down to drain it. The filter is at the very bottom of the valve body and just pops off, a new filter kit will come with a new gasket. Reinstall after cleaning the pan and mating surface of the transmission and refill with the proper fluid through the dipstick tube (yours should use Dex III or IV but check your owners manual) it will take between 5 and 6 quarts.