Step one: Add an html element to the top of your form.
Step two: Paste the code below into your html element.
<link rel="stylesheet" href="colorbox/colorbox.css" /><script src="common/libs_js/jquery-1.4.4.min.js"></script><script src="colorbox/jquery.colorbox.js"></script> <script>var $fb_pop = jQuery.noConflict();
$fb_pop(document).ready(function(){
$fb_pop(".fb_iframe").colorbox({iframe:true, width:"80%", height:"80%"});
});</script>
Step three: Add another html element where you want the link to be.
Step four: Paste the code below into this html element.
<a class="fb_iframe" href="http://www.deloreanjewellery.co.uk/hand-making-signet-rings.html">CLICK HERE FOR VIDEO OF CASTING PROCESS ; OPENS IN A NEW WINDOW</a>