I've learned that it is possible to add a default comment to the custom post type:
However, what if in case of not custom post type?
I would like to add a default comment form to forum template instead of forum editor, and they do not use custom post type.
So the topics and posts are not stored in
wp_posts table, they have their own tables for topics and posts.
How can I add a default WP comment to this forum template?