Adding Adjusted Bounce Rate

<script type="text/javascript">
 var _gaq = _gaq || [];
 _gaq.push(['_setAccount', 'UA-XXXXXXX-1']);
 _gaq.push(['_trackPageview']);
setTimeout("_gaq.push(['_trackEvent', '10_seconds', 'read'])",10000);  // --additional line
 (function() {
 var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true;
 ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js';
 var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s);
 })();
</script>

I’m trying to add the trackEvent into the wp plugin but I can’t seem to find the right location to put the single line of code.

https://wordpress.org/plugins/google-analytics-dashboard-for-wp/