Disqus is a popular service allowing your website visitors to leave comments on your site by logging-in with their preferred service (Google, Facebook, Twitter) without having to register for a separate account. Using Disqus on your Joomla.com site is really easy. This tutorial will cover the following:

Create a Disqus account and add your website

Head over to Disqus.com and sign up with your email. When you register and log in, navigate to Add Disqus to Site. Choose a name for your site (it might be helpful if you pick the same name as your site), a subdomain (this will also be your "shortname", explained in more detail below), and a category:

Select Joomla as your platform in the next step. Since you already have the Disqus plugin installed on your Joomla, you can skip to step 5 on the next page and copy the shortname for your website:

Enable Disqus comments in your Joomla backend

To enable Disqus comments on your website, go to Extensions -> Plugin Manager in the Joomla backend:

Find the SiteGround - Disqus comments plugin in the list and click on its name. You can use the search to find the relevant module as the list of modules might be long:

A new screen with options will load. Paste the shortname you copied in the Disqus admin panel (see previous section) in the Disqus shortname field:

In Mode you can select whether you want to include or exclude Disqus from certain categories. This is useful if you are building a site which has a separate blog section and want to allow comments only under the blog entries. In the Included/Excluded categories field you can select one or more categories to apply these settings to. When you click on the field, a list of all your categories will appear.

Press Save and go back to the front end of your website. Open an article, which is under a category that is included (or not excluded if you chose to use that option). This is what your comments section should look like:

Advanced Disqus options

Disqus allows you to edit multiple options for your comments plugin. Visit the admin section of your site and press Settings. From this section you can find out the Disqus shortname, modify the appearance of the comments section, change the default settings for guest comments and moderation, etc.

By default, anyone who knows your Disqus shortname can include the comments on their site. You can limit this by going to Settings -> Advanced and adding the full URL of your website (for example test.joomla.com) in the Trusted Domains section: