OK, I modified the .htaccess file using the directions on the sh404SEF official site here:
http://extensions.siliana.com/en/sh4...04SEF-FAQ.html
Then I followed the directions below that I got here:
http://extensions.siliana.com/forums...p?topic=8297.0
In your Joomla Administrator area do the following:
Click Components.
Click sh404SEF
Click on "Click here to switch to extended display (with all available parameters" (it's on the right side of the screen in the sh404SEF main area)
Click sh404SEF Configuration (and you'll finally see the Advanced tab)
Click on the Advanced tab
Change Rewriting Mode to "{with .htaccess {mod_rewrite}" (Under Advanced Component Configuration area)
Click Save.
Upon save, the database is purged and records deleted. What do I need to do now?