On an item page, select the "Edit" button above the media player.
This will place you on the item's Access Control settings page.
Select Collection staff only under the item access section
Why not "Logged in users only?" In Media Collections Online the Logged in users only setting lets anyone with an IU login, including IU Guest Accounts. Anyone
Add the group name BL-LDLP-MCO-All-IU-Users under the External Group text field, then select the Add button.
The page will refresh, and the BL-LDLP-MCO-All-IU-Users group will appear under the External Group section.