You're a parent. You use Google Family Link to help provide parental controls on your child's Chromebook and Android devices.
(As Google admits, no parental-control software is perfect. Therefore, you also keep all your child's devices in your own bedroom every night, until the child is old enough to need overnight smartphone access.)
It's true that you can use the "Family Link for Parents" app to change your child's Family Link rules. This app works on Android and iOS. But perhaps you'd rather not install any app.
How can you change your child's Family Link rules using a web browser?