By default, you will be managing a single venue/outlet. All of the rota creation and shift management screens can be used when managing a single location or a group of venues.
The groups are called Venue Groups and you can setup as many ops groups as you need and each group can have as many venues in it as needed. See Venue Groups for more information.
To choose which venue or ops group of venues you are editing choose venue groups under the venue selector in the top right.
The popup has two tabs, Venues and Venue Groups. Your currently selected view be in green and you can just click on an option to change views.