change url of logo

What code would I need to change the header logo url? I saw an answer from a while back that had the below code, but I believe it would need to be customized to go to my "main" page and I'm unsure where to edit it. 

<script src="//ajax.googleapis.com/ajax/libs/jquery/2.1.3/jquery.min.js"></script>

<script>$(document).ready(function () {
         $(".logo a[href]").attr("href", "http://www.google.com/");
       });
</script>

I created a landing page to "enter website" and then made it the home page so that it would be the first thing visitors see when going to the website - now my previous homepage with I relabeled "main" will not be the url destination when you click the logo -- I've put this code into the Header under Code Injection in the Website Tools tab and nothing seems to have changed.  Any help would be greatly appreciated, thanks!