#1 To enable cities, first go to "Cities" under "Managing Listings" in the dropdown menu.
There you'll find a list of all your cities. By clicking on the most right button, you can choose to either "publish" or "hide" a city.
Once it is "published".
#2
#3 You can also "feature" it by clicking on the dropdown section on the left to "published".
Afterwards, you will have cities that show up at the top of your website (red square) and some "more cities":
