Service light on 2012 Mercedes-Benz S550

How do you re set the service light after a 20,000 mile service oil change?

Asked by for the 2012 Mercedes-Benz S550
Turn key to ignition 1, press and hold telephone answer and OK button for 4 seconds, the telephone should be pressed first. The menu should come up. Scroll down the menu and reset and confirm all services done. Your Welcome.
Thanks for trying,but it didn't work ?
It is a 2012 S550