To edit a Zone, go to Administration > Areas panel. After that, you will see the following screen displayed to you:
As tackled here, on the Show filter, you area able to see the existing Places, Zones or corridors:
To edit an already created Zone, select Zone from the Show combo box. After that, all the existing zones will be displayed. Click on the blue link of the respective zone:
After that, the Zone details panel will be displayed to you:
This panel has the same fields and contains the same information as the New Zone panel. If you want to know more, click here.