This helpful Flight School tutorial video will walk you through the steps to giving your users access to other locations.
Click your name in the upper right hand corner to access settings
Click My Team
Click on the user you wish to grant access to the other location
Click on the the location selector and switch to the desired location
Notebird notifies you that the user does not currently have access to that location. Click Add to (location name)
Now select which type of access the user needs to have for the new location
Once selected, the user now has the ability to switch between locations and see the information that is relevant to them.