When you click the little Delete button before the selected Zip/Postal Code, you will get a message warning you that you are about to delete the selected zip code. You have the option at this point to cancel or go ahead and delete the selected record. If you confirm that you want to delete the selected record, VisionCore will delete it and there will be No way of retrieving that zip code again.
The Delete button can be disabled so that other users can't delete any of the Zip/Postal Code records. You can enable or disable the Permission checkbox for Delete Zip/Postal Code in the Security form > Form Permission Tab.