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Set a passcode on your iOS device to help protect your data. Your device will require your passcode when unlock your device, update your software and install iOS configuration profiles.
To change your passcode.
1. Open your Settings 
> Touch ID & Passcode. Enter the passcode if it prompted.
2. Click on the Change Passcode
3. Enter a six-digit passcode. Or tap Passcode Options to switch to a four-digit numeric code, a custom numeric code, or a custom alphanumeric code.
4. Enter you Passcode Again to confirm it.