1. First, slide the screen from top to bottom, find the gear icon above the notification bar, and click to enter the settings. In the settings, find the option of "Users and Accounts" and click Enter.

2. Secondly, in User and Account Settings, find the option of "Add User or Profile" and click Enter. Select Create User, and then fill in the information and settings of the young user, such as user name and password, as prompted.

3. Then, among the newly created users, find adolescent users and click to enter the user setting interface.

4. Finally, in the setting interface of adolescent users, find the options or functions related to adolescent mode and set them according to your own needs.