How do I change the header font to NOT bold

There seems to be no simple option to remove the bold lines from my header text.

I am using josefin sans.

You can inject this CSS code into your form: 

#header_1 {

   font-weight: normal !important;

}

If you need to know how to inject CSS codes into your form, please follow the steps from this guide: https://www.jotform.com/help/117-How-to-Inject-Custom-CSS-Codes