It appears the default comments option for Octopress is true but you will notice that your Octopress blog does not actually have a comment section.

This is because you need to create and configure a Disqus account first:

• Register your webiste here: http://disqus.com/admin/register/
• Retrieve your disqus “shortname”
• Add the shortname to _config.yml:

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# Disqus Comments
disqus_short_name: unleashedweborg
disqus_show_comment_count: true

• You can see I also set discus_show_comment_count to true (which is optional)