How to turn on the screen lock on my HTC Sensation 4G

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You can set a screen lock (password) for your phone. The password will be required to unlock the phone from standby.
1. Touch Menu.
2. Touch Settings.
3. Scroll to and touch Security.
4. Touch Set up screen lock.
5. Touch Password.
6. Enter a password.
7. Touch Continue.
8. Re-enter the password.
9. Touch OK.
10. The unlock password has been set.