How can I set a question as required?

To force the respondent to answer a question you must set the answer required option in question settings.

In order to set the question as required :

1. Press  Edit question button.
2. Go to the question  Settings.
3. Select Answer required option.
   

To set the system message :

1. Go to Languages.
2. Press EDIT button.
3. Go to SURVEY tab.
4. Edit “Questions with asterisks are very important to us. Please fill them in.”

Functionality is available in the Starter, Advanced, Professional, and Enterprise plan.