How to Set a Screen Saver on PC or Mac

macOS

1. 
   Click the

   

   menu. It's usually at the top-left corner of the screen.
2. 
   Click System Preferences.
3. 
   Click Desktop & Screen Saver.
4. 
   Click the Screen Saver tab. It's near the top-center part of the window, to the right of 'Desktop.'
5. 
   Select a screen saver. Your options appear in the left column. Once you make a selection, a preview will appear in the right column.^[1]

   • Some screen savers, such as Floating, Reflections, and Shifting Tiles, allow you to create slideshows of images. Select one of these options, then click Source to choose your own images.
   • To see a full-screen preview, hover your mouse cursor over the small preview, then click Preview.
6. 
   Select when to turn on the screen saver. Click the drop-down menu next to 'Start after' to choose how many minutes of non-use macOS should wait before activating the screen saver.
7. 
   Require a password to unlock the screen saver. This is optional. If you want to have to enter your password to unlock the desktop once the screen saver appears:

   • Click the
     
     menu and select System Preferences.
   • Click Security & Privacy.
   • Click the General tab.
   • Check the box next to 'Require password.'