facebook like button

Hi,

could you tell me how i put a "like button" for facebook on my page?

I copied this code from facebook in the custom js:

<div id="fb-root"></div>
<script>(function(d, s, id) {
  var js, fjs = d.getElementsByTagName(s)[0];
  if (d.getElementById(id)) return;
  js = d.createElement(s); js.id = id;
  js.src = "//connect.facebook.net/de_DE/sdk.js#xfbml=1&version=v2.5";
  fjs.parentNode.insertBefore(js, fjs);
}(document, 'script', 'facebook-jssdk'));</script>

and that code in a "column" and "code" and tried it with revolution slider but it doesnt apear on my website:

<div class="fb-like" data-href="https://www.facebook.com/groovesteiner" data-width="400" data-layout="button_count" data-action="like" data-show-faces="true" data-share="true"></div>

what did i do wrong?