the Website you visited provides an infrastructure for creating surveys /
questionnaires and the collection of the responses from respondents.
The Website does not design a survey / questionnaire for you.
The website you visited only provides you information about the communities population and their responses that have taken the surveys/questionnaires. It can be a good guide on how to keep track of your respondents that have taken your survey/questionnaire by finding a little information about them such as their age group, interests, social class, ethnicity, ect.