Type the zip code according to the correct format (please include spaces, so for example type 123 AB and not 123AB if the format for your country include spaces), then select the city and zip from the list appearing. If you don't know the zip you can type the first letters of the city name and then select from the list the correct zip. If you don't find the city or the zip you can use the manual insert.

How would you prefer to be contacted in case of problems?

If you choose Whatsapp make sure you have indicated a mobile number that can receive messages