What's in it for you
If you want to show Prezi presentations on the iPad, you will have to download the Prezi app (free on the App Store). It is possible to link from within Showpad to launch Prezi presentations via the Link/URL available when building a Channel.
You can use the URL for your presentation (e.g. http://www.prezi.com/
To find out more about URL schemes, more information is available in this article.