How do I change text color on my form?

You can change color of your form text and labels by injecting custom CSS: 

http://www.jotform.com/help/75-Customize-your-Form-using-Custom-CSS-Codes 

http://www.jotform.com/help/117-How-to-Inject-Custom-CSS-Codes 

You can also change it inside of Form Builder by selecting Preferences option. Then select Form Styles tab and change Font color.

You can also change it inside of Form Designer.

Hope this will help. Let us know if you need further assistance.