HTML code editor in CoursePress Pro unit editor

Hey there

I was wondering if it's possible to open up the HTML/code editor in the Wysiwyg unit editor?

I can see that it's been added and then removed. All I'm looking to do is insert this code below. It's a resposive iFrame from MeBox media.

If I can't do it natively in the unit editor, is it possible to do it with a shortcode? And if so, would you know of the best shortcode plugin to use?

<!-- Me!Box -->
<iframe scrolling="no" src="//app.meboxmedia.com/embed/?MeboxId=923" id="MeboxIFrame923" frameborder="0" style="width: 100%; padding: 0px;margin: 0; border: none; display: block;height:0px; overflow: hidden;" allowfullscreen></iframe>
<script type="text/javascript">
(function() {
var u=(("https:" == document.location.protocol) ? "https" : "http") + "://app.meboxmedia.com/";
var d=document, g=d.createElement("script"), s=d.getElementsByTagName("head")[0]; g.type="text/javascript";
g.defer=true; g.async=true; g.src=u+"_core/mebox/MeboxIFrameJS.php?Mebox=MeboxIFrame923"; s.appendChild(g,s);
})();
</script>
<!-- End Me!Box -->