Theres instructions there on how to do it. It involes changing your .htaccess Add this line in .htaccess AddType application/x-httpd-php .php .htm .html Code (markup):
Then if I add that particular line into the .htaccess, then it'll work? What line of code would I have to add to the rest of the html pages in order to activate it?
I think this is the instruction for the webserver to parse .html and .htm as .php files. So if you include php statements in .html files, it will be excecuted in the server before the page is displayed in the browser with co op links.