delete a Prezi account
delete a presentation
change the privacy status of a presentation from public to private
you may find that the presentation is still listed in the search results of popular search engines.
This is because the search engine has indexed the link and this is not always immediately removed from search results. In all cases, clicking on the link that the search engine provides will not allow the presentation to be viewed.
In most cases, your presentation should stop appearing in these results within a month. If you would like the link to your presentation to be immediately removed from search engine results, you will need to contact the search engine provider directly. You can find where to contact some of the largest search engine providers about this here.