Adding Disqus Comments to Blog Posts

I would like to use Disqus commenting system on the site. I'd like to have a Disqus comment section for each blog post. I have a Disqus account and have followed their instructions for installing the plugin, and it even told me "Disqus is not managing your comments." However, there is no Disqus section on the blog post pages. General internet searches seem to indicate that the Disqus section just appears on the post pages, but that has not happened for me. Is there something else I need to do to enable the plug in on each page?