If you aren't sure you entered your Apple ID and password when setting up Screen Time on your own device, reset it this moment.

You might set up Screen Time to put a bar in front of yourself from spending too much time on apps. What if you forget its passcode?

Any time you try to change the settings, or get more time on apps past the limit, you’ll have to enter the passcode. To set one, scroll down from Screen Time, select “Use Screen Time Passcode ...