I'm not familiar with your vehicle, however the principle is the same for virtually all auto transmissions.
Get underneath your vehicle and look on the transmission fluid pan. Somewhere at the lowest point you will see a drain
The plug may either be a nut or a recessed square, or even a hex recess.
Undo the drain plug and allow the transmission fluid to drain into a large plastic dish/container.
The link below shows you generic images of drain/filler plugs. It is not your vehicle:
auto transmission filler plug Google Search
When drained, replace the plug.
Then look for the filler
plug. It will be higher up on the transmission case than the drain plug. Again, it may be a nut or a recessed square/hex.
You then have to use bottles of transmission fluid to refill the transmission. It can be messy ... The small bottles of transmission fluid - they have small tubes attached - can be very awkward to turn upside down when you're under the vehicle.
Alternatively, if you have a a long tube and a funnel you can use it to refill the transmission via the transmission dipstick tube. It can take a while to fill it as the fluid is slow to go down the tube.
Be prepared to get transmission fluid everywhere ...
Replace the same amount of fluid that came out. Start the car and move it through its range of gears. Check the fluid level.
It's not a difficult job. The link below is an easy guide:
How to Add Transmission Fluid
The job is worth doing. It will extend the life of your transmission. Most people never bother. Transmission fluid is supposed to be changed every 20,000 miles.