To add an additional parent / guardian user to the Team Manager App:

Click the person in the circle at the bottom right of your App screen to enter your profile.
Click on your child's account.
Click Add Parent
Enter the relevant information.
The added parent will receive an e-mail to confirm the addition to the app.
You will need to do this for each child if they are in different divisions or teams so that you will receive notifications for each when relevant.