The Multichannel comms app allows you to display posts created in the Studio targeted to the page where you use the app. Posts will only appear inside the app and not directly in the timeline app of a page. The Multichannel comms app can only be used on pages.
Set up the app
Once you've added a Multichannel comms app to your page, you can configure its name. Also, read Apps: Basics for general information on apps.