Edit rights with wordpress

I am using the wordpress plugin. While I am able to edit the spreadsheet as administrator, I am not able to edit the spreadsheet when logged in with ‘Contributor’ userid. I am able to edit the page, but not the spreadsheet.

How can I edit the spreadsheet as a contributor?

You can extend the next array in spreadsheet_data.php

$available_to = Array( 'administrator' => true, 'editor' => true );