fantastic but im pretty stuck here

I am trying to install Profile Url for Joomlapolis which inturn tells me I need

Make sure you have configured sh404SEF/Artio JoomSEF first!

which I tried but wont let me install unless I have the sef_ext.php working

I am stuck on

If you have a joomla 1.5 component that comes with a functioning router.php and want to use it with SEF advanced, you can create a sef_ext.php with the following content:

[replace XXXXXX with the name of the component (after com_)]
<?php
/**
* SEF Advance component extension
*
* This extension will give the SEF Advance style URLs to the example component
* Place this file (sef_ext.php) in the main component directory
* Note that the class must be named: sef_componentname

can any one help me customize this?