1. From the home screen, swipe down from the Notification bar.
   
2. Tap Screen rotation to lock/unlock the screen orientation.
   
3. To access additional display settings, tap the Settings icon.
   
4. Scroll to, then tap Display.
   
5. Tap Brightness.
   
6. Tap the Automatic brightness checkbox to toggle automatic brightness on/off.
   
7. Drag the Brightness slider left or right to adjust the brightness manually.
   
8. Tap Screen timeout to change the screen timeout.
   
9. Tap the desired option.