How do you program key fob for volvo s-80?

To program a key fob for a Volvo S80, first, sit in the vehicle with all doors closed. Insert the key into the ignition and turn it to the "On" position without starting the engine, then press and hold the "lock" button on the key fob for about 5 seconds. Turn the key back to the "Off" position, then repeat the process for any additional key fobs. Finally, test the key fob to ensure it’s properly programmed and functioning.