If you have downloaded the latest Version 4.3.4 then just follow these steps.
- Download the package, unzip and place in your web directory or root folder.
- Provide the read write permissions to that folder (preferably Ubuntu machines )
- Create view page test.php
- Paste the below mentioned code it should work fine.
Load the mentioned js file
<script type="text/javascript" src="/ckeditor/ckeditor.js"></script>
<textarea class="ckeditor" name="editor"></textarea>