You may have to update some include file paths on that page as well... It is probably easier to just use the first suggestion, adding the correct path in the page configuration with:
$CKEditor_config["filebrowserBrowseUrl"] = "/webassist/kfm/index.php?uicolor=eee&theme=webassist_v2&showsidebar=true&startup_folder=cms_files";
I can see the editor does work when I access it at:
Make sure that is secured in some way when you go live. You wouldn't want just anyone able to upload files onto your server.