WP-Photos

hello,
i just downloaded wp-photos and now wondering where i can find edit.php file in order to add this line:
<?php include_once(‘../wp-photos.hack.php’); wpphotos_link(); ?>
it is said: Add this to edit.php before the
tag and after the Edit/Delete links at line 275:
well… i found edit.php under wp-admin but i don’t think or am not sure if this is the right one. am using wordpress 1.0.2
is there anyone there who knows the answer? many thanks in advance ??
michiko