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Settings > Notifications. Select an app and switch on 
Override Do not disturb. 
Applying New Wallpapers 
You can set the wallpaper for the home screen and lock screen. 
1.  Touch the Home key >    > Settings > Display > 
Wallpaper. 
2.  Touch Live Wallpapers, Photos or Wallpapers. 
3.  Select a built-in static wallpaper, live wallpaper, or a picture 
and use it as the wallpaper. 
  NOTE: 
Other way to set the home screen wallpaper and the lock screen 
wallpaper: 
Touch and hold an empty area of the home screen and select the 
Wallpapers tab. Then select a built-in image, a live wallpaper, or 
an image from your gallery. 
Setting the Theme 
1.  Touch and hold an empty place on the home screen. 
2.  In the window that appears at the bottom, touch Themes. 
3.  Select a theme you like.