How do I activate the Child Lock on the WAW285H1?

To activate or deactivate the Child Lock, press and hold both the Finish In buttons (M and N) simultaneously for approximately 3 seconds. When the Child Lock is activated, the indicator lamp lights up, and if a change to programs or options is attempted, the indicator will flash for a few seconds. If the Child Lock is activated, you must deactivate it before you can select a program. (Pages 36, 23)