How do I enable the pattern lock on the Samsung i9300 Galaxy SIII
1. From the Home screen, tap the Option key.
2. Tap Settings.
3. Tap Security.
4. Tap Screen lock.
5. Tap Pattern.
6. Tap Next.
7. Record your pattern, then tap Continue.
8. Record your pattern again to confirm, then tap Confirm.
9. Enter a backup PIN of at least 4 digits, then tap Continue.
10. Enter the PIN again to confirm, then tap OK.
The pattern lock has now been set.