Change Comment Textarea position

function wpb_move_comment_field_to_bottom($fields) {
    $comment_field = $fields['comment'];
    unset($fields['url']); //IT WILL REMOVE URL/WEBSITE TEXTBOX
    unset($fields['comment']);
    $fields['comment'] = $comment_field;
    return $fields;
}

add_filter('comment_form_fields', 'wpb_move_comment_field_to_bottom');

• You can also refer blow link :