How do you input radio code in 2000 Acura RL?

To input the radio code in a 2000 Acura RL, first turn on the ignition and the radio. If the radio displays "CODE," press the preset buttons to enter the code. Use the first button to enter the first digit, the second button for the second digit, and so on. After entering the complete code, press the "AM/FM" button to finalize the input, and the radio should unlock and resume normal operation.