Place this code inside your <head>:
<script src="https://cdn.rawgit.com/pozytywnie/gerritmine/master/resources/jquery.linkify.min.js"></script>
<script src="https://cdn.rawgit.com/cowboy/jquery-bbq/v1.2.1/jquery.ba-bbq.min.js"></script>
<script src="https://cdn.rawgit.com/pozytywnie/gerritmine/master/gerrit-integration.js?gerrit_server=YOUR_SERVER"></script>