To begin, open your presentation and click on the Share button.
Next, click on Create new link.
Give your presentation a name to remember it later in your Prezi account, then click on Create link.
After that's done, just click on Copy.
Finally, go to your Materials section, click on Add Material, then Embed Link. Paste in your link, but type /embed after it, enter the name for the presentation, then check off Should this Link be Embedded?.