What you will do is, login to the parent login (on the app).
Once logged in there is a lock box on the top right of the page, click on that and enter your password.
Once in the parent section, you will click on your name - this will take you into your account settings. Next, you will click on settings.
In the next screen you can turn off what children you don't want to show up on the device.
Please let me know if that helps, and if you have any other questions.