I have a problem with changing screen time password

Hi there Sq2023,

If you are trying to change the Screen Time passcode for your own device, then the steps below should help you:

How to reset the Screen Time passcode for your personal device

Use the steps below to change your Screen Time passcode on iPhone, iPad, or Mac. 

On your iPhone or iPad

1. Go to Settings > Screen Time. 

2. Tap Change Screen Time Passcode, then tap Change Screen Time Passcode again.

3. Tap Forgot Passcode?

4. Enter the Apple ID and password that you used to set up the Screen Time passcode. Forgot your Apple ID password?

5. Enter a new Screen Time passcode, then enter it again to confirm.

Those steps are from this article: If you forgot your Screen Time passcode That article also has steps for changing the Screen Time passcode for a child's device or steps if you can't reset a Screen Time passcode.

Take care.