Just downloaded and installed CK Editor 4. Got the Samples page working and copied the full CK Editor sample page from the start-up docs to my site, but no result.
Here's the code for my index.html file:
<head>
<title>CKEditor Sample</title>
<script src="/ckeditor/ckeditor.js"></script>
</head>
<body>
<form method="post">
<p>
My Edior:<br>
<textarea name="editor1"><p>Initial value.</p></textarea>
<script>
CKEDITOR.replace( 'editor1', {
toolbar: 'Basic',
uiColor: '#9AB8F3'
});
</script>
</p>
<p>
<input type="submit">
</p>
</form>
</body>I've uploaded a picture of my file directory in Dreamweaver.

You removed textarea's id
You removed textarea's id attribute. The name is not enough.
Piotrek (Reinmar) Koszuliński
CKEditor JavaScript Developer
--
CKSource - http://cksource.com
--
Follow CKEditor on: Twitter | Facebook | Google+
Thanks!
Working perfectly