Overview

 Setup a passcode can greatly enhance the security on your iPhone.  Newer models have fingerprint recognition called Touch ID

Step 1 - Tap 'Settings'

 See Below

 Image courtesy of: webcentral.com

Step 2 - Tap 'Touch ID and Passcode'

 See Below

 Image courtesy of:  apple.com

Step 3 - Choose 'Simple Passcode'

 See Below

 Image courtesy of: iphonefaq.org

Step 4 - Tap 'Turn Passcode on'

 See Below

 Image courtesy of:  apple.com

Step 5
Enter a 4 digit passcode at the prompt.  If you want to setup a safer passcode you can.

 Image courtesy of: apple.com

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