The "Header Styles" field does not appear in the designer for my forms. I am trying to change the Header font. How do I get this field?

Hello Again :-) 

I answered this question on this thread: http://www.jotform.com/answers/509358-Can-I-make-the-font-for-my-headings-different-from-the-font-on-the-rest-of-the-form#3

When you load the form on the form designer, clicking on the form header should collapse the relevant menu to the left: 

Give it a try and let us know.