Without macros of this add-on you could call the Piwik API by adding an HTML script tag like this:

<script type='text/javascript'>
   var _paq = _paq || [];
   _paq.push(['setDocumentTitle', 'My Title']);
</script> 

Using our macros allows you to simply add your information via a dialog:

The macro will take care for rendering the JavaScript snippet inside of the HTML script tag.

<!-- Piwik -->
<script type="text/javascript">
  var _paq = _paq || [];
   _paq.push(['trackPageView']);
   _paq.push(['enableLinkTracking']);
  (function() {
    var u=(("https:" == document.location.protocol) ? "https" : "http") + "://[YOUR PIWIK SERVER]";
    _paq.push(['setTrackerUrl', u+'piwik.php']);
    _paq.push(['setSiteId', [YOUR SITE ID]]);
    var d=document, g=d.createElement('script'), s=d.getElementsByTagName('script')[0]; g.type='text/javascript';
    g.defer=true; g.async=true; g.src=u+'piwik.js'; s.parentNode.insertBefore(g,s);
  })();
</script>
<noscript><p><img src="[YOUR PIWIK CALL]" style="border:0;" alt="" /></p></noscript>
<!-- End Piwik Code --> 

Please note that all macros use the JavaScript API. Therefore: If the user has JavaScript deactivated in her browser, the noscript image will be employed and the macro initiated calls will not be counted with Piwik.