If you made the correct changes to your skin as indicated in the article then the editor should use the same css as the site. If you try demo.mojoportal.com you will see the style in the editor is working. Only thing that can't look the same in the editor is the javascript stuff like jQuery tabs etc.
You should compare your layout.master file to included skins and make sure you have added a style.config file and make sure it includes your css files in its list of css files.
Hope it helps,
Joe