How to add a custom attribute to a parent security label?

How to add a custom attribute to a parent security label for Churchteams Check-in?

First go to Settings, Members, Member Attributes, click "New Attribute" and add it there.
Then, go to Check-in, Views/Setup, click on your view, and go to "B3 - Optional Attribute:" and there you would select the attribute that you created and then save your changes.