In all of our Shopify themes, you can enable a Blog to share valuable content and connect with your customers! Learn more about adding a Blog with Shopify's full instructions.
Within your Blog, you can choose to enable comments. You can also replace Shopify's default comments with DISQUS comments instead by going into Theme Settings > DISQUS comments > Enable DISQUS comments.
If you'd like to enable the DISQUS comments, you'll also need to add in your 'DISQUS shortname' in the theme settings as well!
For any other questions regarding the use of DISUQS in your theme, we recommend getting in touch with their support team for assistance!