在线客服代码的插入？

我想插入一段在线客服的代码，但不知到在哪里插入
代码是：
<!--Start of BindChat Live Chat Script -->
<script type="text/javascript">
(function (w, d, e, g, r, a, m) {
w['BindChatObject'] = r;
w[r] = w[r] || function () {
(w[r].q = w[r].q || []).push(arguments)
}, w[r].t = 1 * new Date();
a = d.createElement(e),
m = d.getElementsByTagName(e)[0];
a.async = 1;
a.src = g;
m.parentNode.insertBefore(a, m)
})(window, document, 'script', '//bindchat.com/api/js/all.js', 'bindchat');

bindchat('create', '9405-650-56-1263', '');
</script>
<noscript>
<a href="http://www.bindchat.com/sites/contact/9405-650-56-1263" target="_blank">Feedback?</a>
powered by <a href="http://www.bindchat.com/welcome">Bindchat</a>
</noscript>
<!--End of BindChat Live Chat Script -->