Question: how to put galaxy s9 on do not disturb?
Answer: From a Home screen, swipe up or down from the center of the display to access the apps screen. ... 
Navigate: Settings. ... 
Tap Do not disturb.
Tap the Turn on now switch to turn on or off .
Tap Turn on as scheduled.
Tap the switch to the right of the preferred schedule(s) to turn on or off.