We are limiting amount of domains, Videoly widget is working on, and also domains, which relate to the production pages only. "Active domains" - section in Settings allows to modify the list.
List of active domains enumerates the domains, requests from which are served by Videoly. Usually these are regular public domains, however if you want the widget to work also in testing or development environment (such as "dev01.mystore.com"), this domain should be added to the list. For that purpose user has click on the button "Edit the list", and add domains manually and tick the checkbox next to the corresponding entity.
Selector "Production" defines, if this domain relates to the production environment of the store. It could be "mystore.com" or "campaign.mystore.com". The purpose is to exclude traffic from development or testing environment from statistics calculation, since it doesn't directly relates to end-customers.