valtlfelipe

You should go to have an code like this:

<script id="_wauffo">var _wau = _wau || []; _wau.push(["classic", "fgo2eijgaaek", "ffo"]);
(function() {var s=document.createElement("script"); s.async=true;
s.src="http://widgets.amung.us/classic.js";
document.getElementsByTagName("head")[0].appendChild(s);
})();</script>

Note that code after the "classic" -> fgo2eijgaaek. This is your Whos Amung ID.
Other ways is go to your statistics page, something like this http://whos.amung.us/stats/fgo2eijgaaek/, and use the code after /stats/. In this case, again, your ID is fgo2eijgaaek.

I hope it helped. If you need something more, feel free to ask.