<head>
<script type="text/javascript" src="/ckeditor/ckeditor.js"></script>
<script type="text/javascript" src="/ckeditor/adapters/jquery.js"></script>
</head>
<template name="yourTemplate">
<textarea id="content" name="content"></textarea>
</template>
Template.yourTemplate.rendered = function() {
$('#content').ckeditor();
};