i want to post comment through my webpage to my fb page?

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PHP

i created a fb application and gave my details to it and fb generated a code for my web.
here it is.

the problem is now i can comment through my website to facebook. but comment only view in commented user's profile only. but i need to add comment to my facebook page.

<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/en_US/all.js#xfbml=1&appId=1416720975253784";
  fjs.parentNode.insertBefore(js, fjs);
}(document, 'script', 'facebook-jssdk'));</script>

<div class="fb-comments" data-href="https://www.facebook.com/JSPARKS" data-width="400" data-numposts="1" data-colorscheme="light"></div>