Drive the car get the transmission oil hot.The automatic transmission fluid is changed by removing a drain plug at the bottom of the transmission. The drain plug has a square 3/8 tool to remove it. Allow the oil to drain ,replace the drain plug seal, and refill the fluid trough the dip stick hole (yellow dip stick is located just under the battery area of the engine compartment. Refill with Honda ATF Z1 fluid and check with the engine switched OFF. Drive the car, and switch off the engine recheck the oil level and add oil if required.
The trans fluid maintainence light needs to be reset with a scan tool.