To edit or delete a zone, follow this procedure:
1 Go to the Map tab.
2 Ensure that you are displaying zones on the map by checking the Show zones box in the map legend:
3 Double-click the icon in the center of the zone.
Now you can either delete the zone by clicking the Delete button, or you can rename it, or change the polygon defining the zone:
You can drag the squares around on the map, and each straight line has a greyed out square in the middle of it that lets you create a new angle on the polygon.
4 If you have updated the zone, click the Save button and you are done.