How do you change the font and color of a header?

May I ask what font are you planning to use?

You can use custom CSS in order to change the font and color of the header text. Here's an example:

.form-header-group .form-header {
color: red;
font-family: Arial;
}

Here's a guide on How-to-Inject-Custom-CSS-Codes. Here's the result:

Hope that helps. Thank you.