Set Parent Passcode
The last step to setting controls for your child's Screen Time is to create a passcode, so only you can extend time or make changes. After you set up your child's Screen Time, Family Sharing can also allow you to view reports and adjust settings any time from your own device.
If you're already in a family group, go to Settings, click Screen Time, and tap your child's name. If you need to create an Apple ID for your child, go to Settings, find [your name], click Family Sharing, and then select Screen Time. If you're new to Family Sharing, tap Set up Screen Time for Family and follow the instructions to set up your family.