The information about MegaMenu is vague -
"Activating the mega menu is quite simple: just check the checkbox that gets shown for top level items. All items that are nested directly bellow them will then be converted to columns instead of links. these columns can then hold any number of links, and also text and images since the description field also accepts html code!"
I appreciate the desire to get people to help themselves, though no explanation of why to use 'asdf' (if relevant) or to mention how to use columns, rows or add new menu items to make it easier and quicker to complete the tasks. Hope you understand I'm not whining - just helping you to create better documentation?
I've had a go, so take a look - http://www.entrepreneurscan.co.uk/background/ The Background button is the MegaMenu one....
Is there only one mega menu?