Popads javascript code

Hello i want to know where can i place this code:
<!– PopAds.net Popunder Code for http://www.tuttofilmweb.com –>
<script type=”text/javascript” data-cfasync=”false”>
var _pop = _pop || [];
_pop.push([‘siteId’, 1444526]);
_pop.push([‘minBid’, 0]);
_pop.push([‘popundersPerIP’, 0]);
_pop.push([‘delayBetween’, 0]);
_pop.push([‘default’, false]);
_pop.push([‘defaultPerDay’, 0]);
_pop.push([‘topmostLayer’, false]);
(function() {
var pa = document.createElement(‘script’); pa.type = ‘text/javascript’; pa.async = true;
var s = document.getElementsByTagName(‘script’)[0];
pa.src = ‘//c1.popads.net/pop.js’;
pa.onerror = function() {
var sa = document.createElement(‘script’); sa.type = ‘text/javascript’; sa.async = true;
sa.src = ‘//c2.popads.net/pop.js’;
s.parentNode.insertBefore(sa, s);
};
s.parentNode.insertBefore(pa, s);
})();
</script>
<!– PopAds.net Popunder Code End –>