Basically, you need to edit the
index.php file since this is in place of the
index.html file you might be used to. The only difference, is that the PHP file also includes some scripts which you need to make sure you dont change.
If you open index.php, on line
31 and
32 you will find:
title ?=$startheading;? /title
meta http-equiv="Content-Type" content="text/html"
You can then add additional lines of meta tags below that link. You will find tips on metatags here:
http://searchenginewatch.com/showPage.html?page=2167931
Keep in mind that the most important tag for search engines is the <title> tag, and that will have the text from your startheading parameter in your configuration.