To add a comment system on Drupal 8, follow these steps:
1. Go to the Drupal 8 homepage and log in as an administrator.
2. Go to the “Structure” tab and select “Content types”.
3. Click on the content type where you want to add the comment system.
4. Click on “Manage fields” and click “Add field”.
5. Select “Comment” as the field type and click “Save and continue”.
6. Configure the comment settings as desired and click “Save settings”.
7. Go to the “Manage display” tab and select the comment field to be displayed.
8. Save the content type settings.
9. Go to the “Configuration” tab and select “People” > “Permissions”.
10. Scroll down to the “Comment” section and enable the appropriate permissions for users to comment.
11. Save the permission settings.
Your Drupal 8 website now has a comment system for the chosen content type. Users with the appropriate permissions can leave comments on the content pages.