1. Tap the Settings icon.
   
2. Scroll to and tap Security.
   
3. Tap Pattern.
   
4. Now draw your desired pattern and tap continue.
   
5. Repeat this process. Again draw your desired pattern and tap confirm.
   
6. Now your pattern lock is set, if you forget the pattern, you must perform a master alternate reset.
   Note: See the Troubleshooting tutorial for more information.