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.
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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.
Changing the sub label font color is actually possible by injecting CSS code, read: How to Inject Custom CSS Codes.
The CSS code you'll be needing is:
**note: replace the color #FFCC66 to the color of your choice. To learn more about color hexa values, read Color Hex Color Codes.
Please let us know if you need further help.