Insert script in footer

Hi :).
I have just installed “Insert header and footer” plugin. I am trying to verify my website by installing a “supertag” script. The explanation tells me to install a tracking code on every page where I want to use it, or, I can install it on a centralized footer. Anyone who knows how I can add the script to the a footer like this. I have activated the plugin, but don’t know what to do next.

The script looks like this:

<!– Begin TradeTracker SuperTag Code –>
<script type=”text/javascript”>

var _TradeTrackerTagOptions = {
t: ‘a’,
s: ‘275512’,
chk: ’58d6142016959346dca860da79bb1b05′,
overrideOptions: {}
};

(function() {var tt = document.createElement(‘script’), s = document.getElementsByTagName(‘script’)[0]; tt.setAttribute(‘type’, ‘text/javascript’); tt.setAttribute(‘src’, (document.location.protocol == ‘https:’ ? ‘https’ : ‘http’) + ‘://tm.tradetracker.net/tag?t=’ + _TradeTrackerTagOptions.t + ‘&s=’ + _TradeTrackerTagOptions.s + ‘&chk=’ + _TradeTrackerTagOptions.chk); s.parentNode.insertBefore(tt, s);})();
</script>
<!– End TradeTracker SuperTag Code –>

The page I need help with: [log in to see the link]