I have a lot of experience in facebook applications development. I have developed 200+ facebook applications using PHP, MySQL, jQuery, Javascript, AJAX, HTML5, Wordpress, Facebook API, etc. I can write detailed instructions for adding facebook app to page. I have already done this before.
You can check my reviews to get an idea of quality of my work. Please discuss further so that I can start working on your project. Looking forward to hear from you. Thanks :)