How to add multiple children to China Mobile Smart Campus?

Here's how a smart campus binds two children. Interested friends come and have a look.

Device: iPhone 1 1

System: iOS 14.3

Software: Smart Campus 1.2.5

1. First, enter the smart campus on your mobile phone, and click on mine in the lower right corner.

2. Then click Settings in the upper right corner, as shown in the figure below.

3. Click the secondary symbol in the settings, as shown in the figure below.

4. Finally, choose to add a secondary number, enter the phone number and relationship of the inviter, and bind the two children, as shown in the figure below.