Booking Time Slots not working

I installed Booking Time Slots module and I did every steps listed in README.txt file in this way:

function booking_timeslots_form_alter(&$form, $form_state, $form_id) {
    $my_form_id = 'story;
...
            $fieldname = 'jS, F Y';
...
                $date_after = booking_timeslots_add_time($datetime,array('hour' => 1, 'minute' => 60));

and changed code into calendar-day.tpl.php (inside Marinelli theme) add/party into add/story

but nothing changed, I mean, while trying to book a time, i get a http://domain.com/node/add/story/2009-04-16 10%3A00%3A00 as "simple" node, not just booking anything..

do you have any idea? or someplace where I can find a solution, a tutorial or something.. I really don't understand :/

thank you