Goto to https://go.thanks.io/justlisted/
Enter your name, phone number and Trulia URL. We use trulia to get the property info so you don't have to worry about building anything. An example trulia url is
The easiest way to find the url is by searching Trulia or Google for the address. If you want you can just change the Google search string using the button below.
Continue the last few steps of the postcard builder outlined in the below link.