You can access the admin interface of the videosite from the Console in the Video Site section of Settings.
Pressing the name of the videosite brings you to the non-admin view of the site, and pressing the wrench under "Actions" brings you to the admin interface of the videosite.
The login page to the videosite configurator can also be accessed by appending "/admin" to the url of your videosite. For example, if you have the videosite mycompanyname.screen9.tv then your configurator will be located on the URL mycompanyname.screen9.tv/admin.
You will be prompted for a username and password and these will be the same credentials as what you use to log in to console.screen9.com.