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.
There are a couple of ways on how to style your labels.
First option is to use the Form Designer Tool. Here's a guide to help you further: https://www.jotform.com/help/300-Form-Designer-Tutorial-Let-s-create-fantastic-forms. In the Form Designer Tool under the "Label Styles" section, you can change the styling of all the label elements in your form.
Second option is to use a custom CSS code to specify the specific label you want to style. You'll need the Form Designer for this but it is more related to using custom CSS codes. Here's a screenshot showing how to style specific elements on a form using CSS.
You can learn more about CSS coding on these links:
I hope that helps. Let us know if you need further assistance on this.