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. Tap Display.
   
5. Tap Brightness.
   
6. Tap the Auto-brightness checkbox to toggle automatic brightness on/off.
   
7. Drag the Brightness slider left or right to adjust the brightness manually, then tap OK.
   
8. Tap Screen timeout to change the screen timeout.
   
9. Tap the desired option.