From the Dashboard screen, click the drop-down arrow in the upper right-hand corner, and select from the drop down "Territories"
>>> You will now see the Territories screen and a list of the Territories you are already using/have already setup
To add a new territory option, click +New Territory in the upper right corner
Type the Territory in the Name Field and click Save when done
>>> You will be redirected back to the Territories page
Repeat this process until all Territories have been added
NOTE: Once setup, territories can be selected from a drop-down on the Edit Building Screen