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. Swipe to the DEVICE tab, then tap Display.
   
5. Tap Brightness.
   
6. Drag the Brightness slider left or right to adjust the brightness manually, then tap OK.
   
7. Tap Screen timeout to change the screen timeout.
   
8. Tap the desired option.