In the library under videos you will find a check box in the upper right corner for each video. Select the videos you want to manage. At the bottom of the page you will find several buttons that you can use to Select all, Select none or Inverse (change the selected ones with those that are not selected and vice versa).
When you are satisfied with the selection, you can choose from the following selections in the scroll bar to the right of the buttons:
Delete – deletes all selected movies.
Unpublish – unpublish all selected movies.
Copy to account… – if you have access to multiple Streamio accounts, you can copy all selected videos to other Streamio accounts.
Finally, press the Go button to the right of the scroll bar.