How do you change gear oil for a automatic transmission on a Mazda 323 fuel Injected 16v model 1989?

To change the gear oil in a 1989 Mazda 323 with an automatic transmission, first ensure the vehicle is on a level surface and the engine is warm. Locate the Transmission Fluid dipstick, remove it, and check the fluid level. Then, drain the old fluid by removing the drain plug, if applicable, and replace it with new fluid through the dipstick tube, using the manufacturer-recommended type. Finally, check the fluid level again, ensuring it's within the recommended range, and replace the dipstick securely.