To choose a background, you need to go to the Style menu and then click on the small icon next to the Background Option. For this course, we have created a background to use in the presentation; if you want to use the same background, click on this link to download it TeachMePrezi’s Background.
Once you download it, you have to click on the Prezi’s Background menu’s upload image icon.
Here there is an infographic with some useful shortcuts to keep in mind while editing a Prezi Presentation.