Spriggy is one app with two login options. One for you, and one for your kids.
Please see the following steps so your child can log in to Spriggy:
Open the Spriggy app on their phone
Tap on Log in as a 'Kid'
Enter their username and password
If your child doesn't remember their username or password, you can reset them by:
Log in to your parent profile.
Tap on your child’s profile.
Tap Profile.
Tap Details to view or update their username.
To reset their password, tap Change child’s password.