To change the Screen Time passcode on your child's iPhone, go to the Settings app and tap on Screen Time, then select Change Screen Time Passcode. You'll be prompted to enter the current passcode, so make sure you have that handy. Once you've entered the current passcode, you can set a new one, and you'll also be asked to create a recovery password in case you forget the new passcode. It's a pretty straightforward process, and you can do it all from your child's iPhone, so you don't need to worry about accessing their device or using a computer to make the changes.
