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.
With regards to setting the perfect text colour suited for your form I would suggest you check out this guide: Tips-for-Non-Designers-Using-the-JotForm-Form-Designer
Here's another one that may also come in handy: Form-Designer-Tutorial-Let-s-create-fantastic-forms-
You may also consider checking these tutorials I found over the internet.
Please also note that you can also add CSS codes to your form to set colors to specific text in your form.
If you want you can select a color from this page, http://www.w3schools.com/colors/colors_picker.asp, then let us know which text on your form you would like to apply it to and we will try our best to help you accomplish it.