A widely used tool for commenting on blogs and websites is Disqus. Go ahead over there and in the upper right corner of the page click the “Sign Up” button. Go through the registration steps and then hurry back here and we’ll get started with adding Disqus to your blog.

Now that you’re registered, let’s add Disqus to your blog. Come up with a clever name for your site and enter that in the window for “Site name”. Once you do that it should fill the box under where it says “Choose your unique Disqus URL”. Go ahead and pick a category - “Tech” seems reasonable. Finally, click “Finish Registration”.

The next page that opens up will as you to “Choose your platform”. The first option is “Universal Code”, go ahead and click on that. You will see something that looks like this:

  <div id="disqus_thread"></div>
  <script type="text/javascript">
      /* * * CONFIGURATION VARIABLES: EDIT BEFORE PASTING INTO YOUR WEBPAGE * * */
      var disqus_shortname = 'example'; // required: replace example with your forum shortname

      /* * * DON'T EDIT BELOW THIS LINE * * */
      (function() {
          var dsq = document.createElement('script'); dsq.type = 'text/javascript'; dsq.async = true;
          dsq.src = '//' + disqus_shortname + '.disqus.com/embed.js';
          (document.getElementsByTagName('head')[0] || document.getElementsByTagName('body')[0]).appendChild(dsq);
      })();
  </script>
  <noscript>Please enable JavaScript to view the <a href="http://disqus.com/?ref_noscript">comments powered by Disqus.</a></noscript>

Don’t do anything with that code. Rather, you will need to slightly modify this to add the following lines immediately after the line that says var disqus_shortname (be sure to replace ‘example’ with your github user name):

    <div id="disqus_thread"></div>
    <script type="text/javascript">
        /* * * CONFIGURATION VARIABLES: EDIT BEFORE PASTING INTO YOUR WEBPAGE * * */
        var disqus_shortname = 'example'; // required: replace example with your forum shortname
    		var disqus_identifier = '{{ page.url }}';

    		var disqus_url = 'http://example.github.io{{ "{{ page.url " }}}}';

        /* * * DON'T EDIT BELOW THIS LINE * * */
        (function() {
            var dsq = document.createElement('script'); dsq.type = 'text/javascript'; dsq.async = true;
            dsq.src = '//' + disqus_shortname + '.disqus.com/embed.js';
            (document.getElementsByTagName('head')[0] || document.getElementsByTagName('body')[0]).appendChild(dsq);
        })();
    </script>
    <noscript>Please enable JavaScript to view the <a href="http://disqus.com/?ref_noscript">comments powered by Disqus.</a></noscript>

Copy and paste this code into a new file called comments.html and save it into the _includes folder. Go ahead and do the following from the command line:

git add _includes\comments.html  
git commit -m "Initial commit"

Now open up _layouts/post.html. In the middle of the file you’ll see a line that says {{ "{{ content " }}}}. Insert a line after that and add this {{ "{% include comments.html " }}%}.

Save and close the file, commit the change, and push:

git add _layouts/default.html  
git commit -m "Added comments to layout"  
git push

Now go to your browser and hit refresh. At the bottom you should see the Disqus commenting pane. Well done!