In order to apply the popcorn effect, you need to target a div such as this:
$('#popcorn').popcorn({   
    fadeImage: 'images/white-box.png',
    fadeImageSpeed: 100,
    fadeSpeed: 'slow',
    imageCount: 3,
    timeout: 2000
});

There are a few options that you can set.
fadeImage (optional) - fades into this image before popping in a new image
fadeImageSpeed (optional) - the speed that the existing image fades into the fade image
fadeSpeed - the speed of the fade into the new image
imageCount - the amount of images that will be displayed
timeout - how long the images appear before new ones are selected

The div that you target will need to be structured the following way:
<div id="popcorn">
	<div class="popcornContent">
		<ul id="nolist">
			<li><a href="#"><img src="image.jpg"/></a></li>
			<li><a href="#"><img src="image.jpg"/></a></li>
			<li><a href="#"><img src="image.jpg"/></a></li>
			<li><a href="#"><img src="image.jpg"/></a></li>
			<li><a href="#"><img src="image.jpg"/></a></li>
		</ul>
	</div>
</div>