The site header can support one “call to action” button that will appear to the left of the search bar when set. This button is in a prominent place and brightly colored to draw attention to a specific action you would like your site visitors to take. The settings for the header call to action button are found in the Customizer.
To create the button, add text for the button in the field labeled “Call to Action Text” and paste the URL for the button in the field labeled “Call to Action URL”.
Click the blue “Publish” button to save your changes and make them visible on the site.