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.
I cloned your form for this particular thread to make some tests. To change the font color of text boxes. Please follow these steps;
1) Click on "Designer" button from the toolbar.
2) Select "Text Box" and change your color through right panel "Textbox Styles", and "Save" the changes.
3) You'll see, selected font color has been applied to the entire form.
Please refer to this guide to make better forms through "Form Designer";
Hope this helps, do let us know, if you need further assistance, we would be happy to help you in any regards.