GoDaddy's Website Builder lets you add your own code (HTML, CSS and JavaScript) to your website. This allows you to extend the capabilities of your site with such things as custom forms, maps and special-function buttons — to name only a few options.
See GoDaddy's article "Add HTML or custom code to my site" at https://www.godaddy.com/help/add-html-or-custom-code-to-my-site-27252
Insert our banner code in Custom Code section, leave Section Title and Pixels blank.