01. Select "Edit Path" from the lower left menu in your Prezi editor
This is within the path toolbar on the left hand navigation.
02. Select the star icon on the left side of the frame you want to animate
Animations can only be applied to objects that are within a frame already.
03. The animation wizard will popup
04. Hover over the object you want to fade-in
The object will fade as you hover over it.
05. Click to apply the fade-in effect
A number will appear in the green star to indicate the animation has been applied and the order by which it will fade-in.
06. Preview the animations within your frame by clicking the play triangle in the top right corner of the animation wizard
Click the reset button in the top left corner of the animation wizard to remove all animations from the frame.
07. Select "Done" in the top right corner of the animation wizard to apply animations
Now when you present your objects will fade-in as you specified.