Within the app pages can be locked down to require a custom password which when entered allows the user access to the page. Once the user has entered the password the page will remain unlocked.
Adding a password:
In the Core, select the Content section and navigate to the page which you want to add a password. Go to the Page Settings.
The password field is the code that will need to be entered to unlock the page and the message will be shown to the user when opening the page. The case sensitive option controls whether the password field is case sensitive.
Once all fields are filled out, simply click save to finish adding the password.