Users navigating to and from Apps

Can you iframe an App into a Dashboard? Maybe we are doing something wrong, but when we plug the App's generated iframe info and place it into a card on a dashboard the connection is refused.

Our users tend towards the very casual side and a lot seem to struggle with even the dashboard menu. As we begin to build Apps we are very worried about our end users finding them and once in an App figuring out how to get out. We were thinking this could maybe be solved if the App was basically another dashboard for them.