1. Park your vehicle on a level surface and apply the parking brake.
2. Locate the transmission pan. This is typically a metal pan located underneath the transmission.
3. Place a drain pan under the transmission pan.
4. Loosen the drain plug on the transmission pan and allow the fluid to drain.
5. Reinstall the drain plug.
6. Add new transmission fluid through the dipstick tube. Refer to your owner's manual for the correct type of fluid and amount.
Please note that changing the transmission fluid in a 2003 Honda CR-V can be a complex procedure. If you are not comfortable performing this task, it is best to consult a qualified mechanic.