First, you have to create a new theme folder and by using the code editor, create five text files Style.css, Index.php, Header.php, Sidebar.php, and Footer.php. Then, change the previous CSS with a WordPress-style sheet. The third step is to split HTML into several pieces and let CMS put the segments together to match the details. After that, change the Header.php and Index.php for WordPress. Lastly, capture a screenshot of the theme and upload it. If this doesn’t seem doable, a web development company in the USA can do it for you.