If you're only using HTML on your site then WD will have to have the HTML page in the webfiles folder at Tony suggested. You can still produce your own page but have WD add the data and then upload the whole web page to your server.
The other option is to use PHP coding where the web page what the tags coded into the page and then uses PHP script to fetch the data from a small text file, as Cumulus does with the Realtime.txt, WD has the clientraw.txt file.
You can also make your own PHP file or just use the testtag.php that comes with WD, which you'll find the main program folder.
The website templates created by Ken True use this method and combine testtags.php with clientraw.txt to give a live update to the site, you can find the templates
HERE and they are free to download.

Having your site working this way means that you save on bandwidth as you're only uploading small files instead of complete pages, and you can use the tags on any page you want.