As soon as your petition is approved by USCIS and you are notified by NVC of the receipt of your file, you must register with a courier service by visiting the following website: https://ais.usvisa-info.com/en-il/iv.  Registering will allow us to send you the appointment letter and will allow you to track the delivery status of your documents, especially your immigrant visa when issued.  Please note that you will not receive any documentation from our office if you do not register. Registration is not complete until you select a courier (Wassel or Israel Post).