XF 1.2 how to load javascript in index.php

Hi All,

I would like to attempt implementing this http://www.webdevdoor.com/javascript-ajax/custom-twitter-feed-integration-jquery/ into my xenforo, I need extra styling that Twitter doesn not offer.

Im a newbie to the xenforo software so I could do with a few pointers.

If I wanted to add some links to the index page:

<script type="text/javascript" src="js/jquery-1.8.2.min.js"></script>
<script type="text/javascript" src="js/twitterfeed.js"></script>
<link href="css/twitter-styles.css" rel="stylesheet" type="text/css" />
How would I go about doing this please?

Also, if I wanted to upload any related files, is this normally done in a certain folder?

Many Thanks