Click the insert button(the button with the big plus) on your moonfruit editor, select insert html snippet then drag the snippet to the place where you want the code item to display, on the editor click the "set up" tab then paste code into the text area. Preview your site. It's very simple. Visit my site www.zaam.moonfruit.com
Open that website with Microsoft frontpage or notepad. Frontpage will show you the html tab to insert html. In notepad it will be opened in the html mode.