Add Piwik Tracking code to page

Add the tracking code to one of your theme files, most likely footer.php.

The easiest way to do this is to go to your admin panel and go to Appearance > Editor, and on the right side, find the entry for Footer (footer.php), and then insert the code right before the closing </body> tag. Update the file by clicking the button below the text box, and you should be good!