What is JotForm?
JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
At JotForm, we want to make sure that you’re getting the online form builder help that you need. Our friendly customer support team is available 24/7.
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.
You can accomplish that by using the Designer Feature, simply once you are on the edit mode of you form:
1) Click on Designer:
2) Click on CSS tab, then click on the text box you want, and click on "Font Family", there enter the font family type you want, in my case I entered Comic Sans MS:
You might want to see our Form Designer tutorial to help you create fantastic forms!: http://www.jotform.com/help/300-Form-Designer-Tutorial-Let-s-create-fantastic-forms-