In the Delivery Areas section scroll until you find Areas.
In the action column Select the Edit Button beside the Area you wish to edit.
If you want to Delete an area, press the delete button on the action Column.
The Delivery Area Details pop-up will appear. Make the relevant Changes to the area description or the Price.
When you have finished press Save.
If the price you would like is not in the drop-down Menu simply press +Add New Price.
A pop-up will appear enter the price and press Save Price.