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" " It should turn green. If the passcode window doesn't pop right up, hit "Set Passcode." Make this something you'll remember, but your child or other restricted user won't know. You will then be asked to enter it again for confirmation. After doing so, you can exit the Settings.

Summary:
Click on Settings from your main iPad home screen. Select "General" and then hit "Accessibility. Scroll down and select "Guided Access. Turn Guided Access by hitting the button. Enter a passcode that you'll want to use to exit Guided Access mode.