@Nisthar Ok. That was because of markdown plugin being disabled.
I had to enable "Allow HTML" option to make redactor plugin to work.
First one is nodebb-plugin-composer-default, second one is nodebb-plugin-composer-redactor
@Dk is your site public? I can take a look if it is.
@pichalite sloved, i find acp enabled Use a separate route for the composer
but i find some bug, in new page you can't add tag and use the reply button