The stream's Summary tab shows you the stream versions, lets see the change log. From there, you can:
Click on a version to go to the stream definition for that version of the stream.
Click on View Change History, select a version, and see its history of changes.
Click the Checkout button to make changes to the stream
Click on the stream's gear icon to take additional actions:
Edit Details - Change the name of the stream, it's description, or the person to notify in the event of an error.
Clone this Stream - Copy the stream and use it as the basis for a new stream.
Retire this Stream - Deactivate the stream, so it no longer appears in the forms catalog. (It can re reactivated it any time when viewing the list of Retired Streams.
Export this Stream - Create a stream definition file that can be used as a backup, or imported into another Pulpstream instance.