The widget works based on Zillow API. Results are returned from Zillow.

Go to this URL to take you Zillow API Key – https://www.zillow.com/webservice/Registration.htm

The Zillow results page is created from Admin – Pages – New Page – Template – Zillow – Save

Zillow requires an API key which you insert in Admin – Appearance – Zillow API Key

Last step is to go and add the Zillow Widget to any sidebar.