My i-phone screen goes dark really quickly

My i-phone screen goes dark really quickly.  How do I change the setting?

Hey there Snow Falls,
It sounds like you would like to change the amount of time it takes for your phone to automatically lock. This function is located in your Settings on the phone:
Set the amount of time before iPhone locks
Choose General > Auto-Lock and choose a time.
From: iPhone: About General Settings
          http://support.apple.com/kb/ta38641
Thank you for using Apple Support Communities.
All the very best,
Sterling

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