Field site in the comments

Forgive me for my English, I’m not an English speaker. I translate through google translate.

The site is allowed to leave comments to non-registered users, where they must indicate their
Name
E-mail address
site
I need to disable, hide the field site in the comments  http://prntscr.com/kqtmj7
Thank you.

Found a solution. Maybe someone needs.
Added code in functions.php

// Удаляем URL из формы отправки комментариев
add_filter('comment_form_default_fields', 'sheens_unset_url_field');
function sheens_unset_url_field ( $fields ) {
  if ( isset($fields['url'] ))
  unset ( $fields['url'] );
  return $fields;
}

This code helped me.