How do I insert custom code from MoPub

<script type="text/javascript"><!--
    mopub_ad_unit = "??????????????????????????";
    mopub_ad_width = 320; // optional
    mopub_ad_height = 480; // optional
    mopub_keywords = "custom keywords"; // optional
    //-->
</script>
<script src="http://ads.mopub.com/js/client/mopub.js"></script> [/code:3btj74ty]

Is that possible? I am using Ejecta to export to iOS.