Copy and paste the code below into your page immediately before the </body> tag.
Before you copy the code we have to assign your website a unique identifier.
<script type="text/javascript">(function(d, t, e, m){
window._rws = window._rws || [{
huid: "your-unique-site-id",
uid: "your-site-public-key",
source: "addthis",
options: { "style": "oxygen" }
}];
// Append Rating-Widget JavaScript library.
var rw, s = d.getElementsByTagName(e)[0], id = "rw-addthis-js",
p = d.location.protocol, a = ("https:" == p ? "secure." +
m + "js/platform/" : "js." + m + "platform/"),
ck = "Y" + t.getFullYear() + "M" + t.getMonth() + "D" + t.getDate();
if (d.getElementById(id)) return;
rw = d.createElement(e);
rw.id = id; rw.async = true; rw.type = "text/javascript";
rw.src = p + "//" + a + "addthis.js?ck=" + ck;
s.parentNode.insertBefore(rw, s);
}(document, new Date(), "script", "rating-widget.com/"));</script>