The Content panel holds all your Scenes. And inside the Scenes are all the tweets, emails, SMS and blog posts for your experience. It also references the YouTube videos, Flickr photos and other documents. 

Scenes are used to organize your content - emails, text messages, blog posts, tweets and Containers.
Scenes can be renamed, reordered and deleted.
Content can be renamed, reordered, deleted and moved between Scenes but it cannot change type. For example, an email message cannot become a tweet message.
Double-clicking a content row will open the details in several panels as shown below. All these controls are explained ahead!