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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There are different ways you can change the font color. The easiest way is mentioned step-by-step below;
1) Click on "Designer" button from toolbar to open Theme Designer.
2) Select the form field you want to change the font color of.
3) Click on "Label Styles" from right tool bar, and select your font color.
4) You'll notice the selected color was applied to your form.
Do let us know if you need further assistance, we would be happy to assist you.