How to Add an Animation Effect to a PowerPoint 2013 Slide
To preview the animation, click the Play From button at the top of the Animation task pane.
Or, if you prefer, just run the slide show to see how the animation looks. If nothing happens, click the mouse button to start the animation.
If you add more than one effect to a slide, the effects are initiated one at a time by mouse clicks, in the order you create them. You can drag effects up or down in the custom animation list to change the order of the effects.