To change transmission fluid, follow these summarized steps:

1. Warm up the transmission by running the vehicle for about 5 to 10 minutes.
2. Secure the vehicle and locate the transmission fluid pan underneath.
3. Place a drain pan below and remove the drain plug to drain the old fluid. If no drain plug, remove the transmission pan bolts to drain.
4. If applicable, remove the transmission filter and replace it with a new one.
5. Clean the pan and gasket surfaces, reinstall the pan or tighten the drain plug as needed.
6. Add the correct type and amount of new transmission fluid through the dipstick tube or fill port using a funnel.
7. Start the engine, shift through all gears to circulate fluid, then check the fluid level and add more if necessary.
8. Take the vehicle for a short test drive and ensure smooth shifting without leaks.

Always consult the vehicle’s owner manual for the specific fluid type and change intervals, and use the proper tools and safety equipment during the process.