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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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Thanks for asking. The selector for that element is .form-description-content
So, let's say you wanted to enlarge the font size to 12px (12 pixels). You would add the following rule, either in the injected CSS or CSS tab of the form designer:
Of course, you're not limited to changing just the size. You may also want to change the font style to (say) italic:
That's how it's done. If you would like further help with this, we'd be happy to provide it.