In Settings
1. Select Location and security
2. We press on screen lock switch
3. If you have an old pattern we introduce, if not move on to step 4
4. Then hit-pattern (that is how the pin)
5. We make a pattern on the screen and click on continue
6. We confirm the repeating pattern and re-confirm
When we turn off the screen (or us turn off manually with a short press on the power button on) and we want to reactivate prompted to enter the pattern to unlock the terminal.
Note: The easiest way to recognize a pattern is looking at the dirt from the screen