It's the same app with different logins. When a parent logs into their account they see a different set of screens with access to more information than their child.
The Child login does not have access to the Parent Wallet.
To sign in as the Parent login:
1. The username is your email address OR mobile number
2. The password created during set-up or tap "Forgot Password" which will send a link to your email to reset the password (check spam too!)
To check the Child login details:
1. Sign in as the Parent
2. Tap on the child in the carousel at the top of the home-screen
3. Here you can check the child's username
4. Tap "Change Password" if unsure of the password for the child login