Goodness. It looks like you did set that up correctly. But it looks like that’s not quite going to work. The jQuery that makes the mega menu open up will prevent the links at the top from opening up something different.
I experimented just a bit and came up with another option for you. The drawback here is the home button will have to stay on the left. It won’t be possible to include it in the menu items that are centered since it’s in a separate parent container.
Delete what you added in earlier. You can actually remove all reference to that link.
Then edit the header.php file. Right below this:
<div id="header-content" class="clearfix">
add in this:
(Be sure to copy that code directly from the support site and not the notification email)
and save your changes. When I gave that a shot, I ended up with something like the attached image. While it works, it won’t be centered there.