something is not right

hi
just tried ur solution but it’s not working for me.
I added ur class to wordpress\wp-includes\comment-template.php line 1524

'author' => '<p class="comment-form-author clrFld">' . '<label for="author">' . __( 'Name' ) . ( $req ? ' <span class="required">*</span>' : '' ) . '</label> ' .
		            '<input id="author" name="author" type="text" value="' . esc_attr( $commenter['comment_author'] ) . '" size="30"' . $aria_req . ' /></p>',

https://www.ads-software.com/extend/plugins/clear-fields/