To exit Fire for Kids, they can opt to exit a profile, returning to the lock screen with all the user profile icons on it. (pocket-lint.com)
You should be able to notice a generic profile icon in the upper right of the lock screen and when the notifications bar is pulled down. (android.gs)
The app has also created a new profile icon that users can display to let other singles know they want to meet up on the 14th February. (globaldatinginsights.com)