The Examples section includes three links to pre-constructed sample questionnaires. Clicking on each of the three Example links displays the questionnaire underneath. Fill out the questionnaire to learn about the many things you can do with questionnaires besdes just asking simple questions. The second and third examples are similar; the third example using the most advanced features to make the most out of a questionnaire.
Below the three Example links, there is a link that takes you to the Examples place where you can inspect them to see how they were constructed. When creating a questionnaire of your own, you can also copy the examples from the Example place to your own place and modify them.