Questions about problems import file .xlsx to database

I am having a problem and look forward to receive the support from everyone.
I follow the a some steps like address : http://bakery.cakephp.org/articles/melgior/2010/01/26/simple-excel-spreadsheet-helper    . But I still have not finished
I am a file "participants.xlsx" and I want to update of its content on database

I do not know where it is stored - The file participants.xlsx are stored in the path ???

Step1 and Step2 has stabilized
Step3 I've created file : 

------------------------------------------------------------------------------------------------------------------------------------------------------------

Participant.php (I'm not sure it's true )  and content :

<?php 
    $excel->generate($event['Participant'], 'Participants list '.$event['Event']['name']); 
?>

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I've created the file EventsController.php same as instructions
Where I was wrong. I do not know how to make it run successfully.
Please be guided every step. I started to learn about cakephp .
Thank all !

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