expanding search box in fixed header top menu?

Hello, Thank you for this excellent free theme brother! I would really really like to implement an 'expanding search form/box' in the fixed header top menu to the far right of the menu bar. I would like the search form to be a magnifying glass button that when you click on it the search box expands just below the menu or at least in a way that it doesn't push the other menu item over. Here is a link to my site: http://www.myinnerfire.net I don't understand how to: 1. Where to place coding for custom search forms that I find online that include things like (html snippets, css snippets, and java script). I need advice on how to actually implement these codes into wordpress. 2. And second, I really really want the search to appear, just as stated above, in my fixed header top menu. I'm using catch evolution free version. Please help!