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PS Forgot to add Welcome [webmasterworld.com] to WebmasterWorld, CyanideRush :).
Imagine this, you rename an HTML(page.html) page to php(page.php) and do not even change the file. No, <?php?> tags, just the same HTML page. It will render exactly the same as if it were named .html.
So, just look for the <head> section of the page and add the line in there. If you don't see a head section, then the file you are viewing is probably being included from a master file which does have the <head> section.