How to Open Comments in theme wich is without comment parts

I don’t know if there is an error in your template or you are not expecting the behaviour of the template, because when I visit the page that you have created “Comments for adventour hostel” the fields for commenting are there.

I don’t know if there is an error in your template or you are not expecting the behaviour of the template, because when I visit the page that you have created “Comments for adventour hostel” the fields for commenting are there.

Yes, “Comments for adventour hostel” is working but i coulnd’t active comments on other pages.
For example;
https://www.adventourhostel.com/room/mixed6dorm2/

in this page ? want to active comments.

Then I believe your theme doesn’t support comments on those pages. If you have any coding skills then go to the editor to edit the template and check for this code: commments_template();
If it doesn’t appear then you can add this:

<?php if ( comments_open() || '0' != get_comments_number() ) : ?>
	<?php comments_template( '', true ); ?>
<?php endif; ?>

yes, I believe that too. My theme doesnt support comments in firstchild pages. I need to enable it.

so
in which php file that i would search “comments_template(); ” line.

It depends on the theme and how the files are named. Do you have any file similar to “single-room” when you are on the Appearance->Editor?