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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.