How to Remove url option from comments wordpress

You could try adding a filter to your wp-content/themes/your theme name/functions.php
try inserting it in functions.php after the opening php tag: <?php 

add_filter('comment_form_default_fields', 'url_filtered');
function url_filtered($fields)
{
  if(isset($fields['url']))
   unset($fields['url']);
  return $fields;
}