I'm a little confused- on the page you've cited, I only see Smooth Navigational Menu- so as you asking how to replace that one with DD Mega Menu instead? If you look at example #1 of the later, it essentially is a top menu bar with multiple levels of drop downs using Mega Menu. Simply follow this template to creating additional levels, whereby each level is simply a UL list on the page that's then associated with a link via the "rel" attribute, for example:
Code:
<div id="megamenu1" class="solidblockmenu">
mega menu contents here...
mega menu contents here...
mega menu contents here...
<a href="#" rel="megamenu2">Mouse over me</a>
</div>
<div id="megamenu2" class="solidblockmenu">
2nd mega menu contents here...
2nd mega menu contents here...
</div>
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