JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
Do you mean that you want your form to have a question on it that must be filled in compared to the rest of the questions on your form?
To do this all you have to do is set a field as required.
You can even go so far to set a condition so that the requirement is based on another field if needed.