How to create like this in blogs -

I thought that only lichess could do that, but now I see that Normal users can do it too, well example blog - lichess.org/forum/community-blog-discussions/ublog-DzjHeprV
Here we have a button called ' Discuss this topic in forum '

How can we create that?

Just use the "Enable comments" flag when creating/editing a post.

@pepellou said in #2:
> Just use the "Enable comments" flag when creating/editing a post.

Thx :D