How to change the screen timeout setting on my HTC Windows Phone 8S

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You can choose a lower screen timeout setting to help save battery power on your HTC Windows Phone 8S.
1. Swipe left to go to the App list.
2. Scroll to and touch Settings.
3. Touch lock screen.
4. Scroll to and touch Screen times out after.
5. Touch the required setting (e.g., 30 seconds).
6. The setting has been changed.