1. First, make sure you have successfully registered and activated your Xueyouyoujiao APP account.

2. Open the Xuyouyoujiao APP and enter the main interface.

3. Click the "My" or "Personal Center" option at the bottom of the screen.

4. In the "My" or "Personal Center" page, find the "Child Management" or "Child Management" option.

5. Click "Child Management" or "Child Management" to enter the management interface.

6. In the management interface, you will see the option of "Add Children" or "Supplement Children", click this option.

7. Next, follow the prompts to enter the first child’s name, ID number and activation code (usually provided by the class teacher).

8. After completing the input, click the "Next" or "Confirm" button.

9. Repeat the above steps, click "Add Child" or "Supplement Child" again, and then enter the second child's name, ID number and activation code.

10. After completing the input of the second child's information, also click the "Next" or "Confirm" button.

11. The system will automatically add the two children to your account, and then you can manage their learning progress and course schedule in the APP.