How to Invert Scrolling on a Mac

Using a Trackpad

1. 
   Click the Apple icon. It's the Apple logo in the top left corner of the menu bar.
2. 
   Click System Preferences.
3. 
   Click the "Trackpad" icon.
4. 
   Click Scroll & Zoom.
5. 
   Click the "Scroll direction Natural" check box to uncheck it.
6. 
   Click the red "X" button. Your scroll settings will be saved.