How do I change my screen time password on my iPhone 12?

To change your Screen Time passcode on your iPhone 12, you will need to follow these steps:

1. Go to Settings on your iPhone.
2. Tap on Screen Time.
3. Tap on Change Screen Time Passcode.
4. Tap on Change Screen Time Passcode again.
5. If you remember your old passcode, you will be prompted to enter it. Then, enter your new passcode and verify it.
6. If you forgot your Screen Time passcode, tap Forgot Passcode?
7. You will be prompted to enter your Apple ID and password.
8. Once verified, you can create a new Screen Time passcode.

The process, as explained in the reference video, involves navigating through the Screen Time settings. The key part when forgetting your current passcode is using your Apple ID to reset it and create a new one. You first try changing the passcode in Screen Time settings, then if you don't know your current password you can recover it by tapping Forgot Passcode. The recovery process will then take you through entering your Apple ID and Password to confirm your ownership of the device, and allow the creation of a new passcode.