Locations can be used for all different service types that you run. Youth, Kids, Playgroups etc. can all be setup with their own set of logos, backgrounds, videos and images for ease of use within those ministries.
Login to the Admin area
Click Locations in the side menu
Click the "Create New Location" button
Enter the location name, username, password.
Select the theme you wish this location to use (the theme will need to have already been created on the themes page).