Here you can get information about How to Change iPad Passcode. If you need to alter your passcode, keep in mind you’ll need to enter your current one before you can change it.
Set a passcode on your device to help protect your data. If your device supports Touch ID, you can often use your fingerprint instead of your passcode. If your device supports Face ID, you can use face recognition instead of your passcode.
Change to your passcode on iPad
Step 1: Firstly Open the Settings.
Step 2: Swipe down and select the Face ID & Passcode (or Touch ID & Passcode)
Step 3: Enter your existing passcode
Step 4: Swipe down, tap Change Passcode
Step 5: Swipe down on the Face ID & Passcode screen and click Change Passcode.
Step 6: You can tap Passcode Options just above the keypad if you’d like to use a custom alphanumeric code or a four-digit code.