From the Manage Libraries page, you can see all of your available media libraries, and can create additional libraries using the plus icon at the lower right corner of the page.
To duplicate a library, click the Duplicate Library icon.
To edit the library, click the pencil icon.
To delete a library, click the trashcan icon.
If a library is synchronized to an outside source such as YouTube, you can click the refresh icon to force a synchronization.
For more information on media library setup, see the Media Libraries page under Content Sections in these instructions.