it's in your admincp/index.php file.
just add things like this:
Code:
construct_nav_option($vbphrase['scheduled_task_manager'], 'cronadmin.php?do=modify', '|');
construct_nav_option($vbphrase['add_new_scheduled_task'], 'cronadmin.php?do=edit', '<br />' );
construct_nav_option($vbphrase['scheduled_task_log'], 'cronlog.php?do=choose', '<br />');
construct_nav_group($vbphrase['scheduled_tasks']);
First all the options with the phrase, the link and a <br /> at the end (no one is sure why some have a |

)
and then the group, with the phrase.