You will need to know which page you want to add the html code to, example index page (home page), a new page (you would need to create a new page first (see article on adding a new page) or another existing page
1) Click the "Web Editor" tab and then the "Web Editor" subtab
4) In the web editor mode click the cursor on the page where you would like the code to appear
5) Click the insert html button
6) Paste in the code in the insert html code window
7) Click the "OK" button.
8) When finished. Click the "Save Changes" button on the bottom of the editor.