To submit a Zillow application, all required fields have to be filled out. If you do not have an email address for a landlord or employer, feel free to use a null address such as email@example.com or your own email. Similarly, if you do not have the phone number for a landlord or employer, you can enter a null phone number or your own phone number. You can then explain the situation directly to the landlord. You can find landlord contact information at the top of your application.