Add FB Like Button to Wordpress Theme Gallery

I have bought this WP theme: [login to view URL], as you can see, there's a full gallery slideshow. I need to add a Facebook Like Button where currently is located the label "Change Skin". The Like Button is to make more viral the gallery. The FB like button counts is different for every picture in the gallery, so every slide has its likes. The link that goes behind every like or share button is the link of the single image. The theme is responsive, so I also need that the new media button would be included in the available resolutions. Because the theme will update anytime soon, I need that you comment in file, and document apart what you change and add, I attach the php and style of the page template for fullsize-gallery I think would be needed. The job is to do immediately. Thanks.