To use the quick access each user is required to setup a PIN, they can do this by going to their profile settings and heading to "Set PIN"
Create a 5 digit PIN and click "Continue".
When the feature has been activated you will be directed to a new login screen and anyone that has set a PIN will be able to click their name and login with their PIN
Anyone that has not set a PIN will be able to login with their password by selecting "Add Existing Account".
Please Note: If you use a new device then you will have to use your password to login the first time.