Hook Update_N

Hallo liebe Leute, ich will nachträglich im Date Modul den Haken bei "Wiederholen" wegnehmen, leider ist dieser ausgegraut da schon Inhalte in der Datenbank sind.

Ich habe dann dieses Script gefunden, habe nur keine Ahnung wie ich das ausführe, irgendwelche Tipps?

function MYMODULE_update_7101() {
// Activate the required modules.
module_enable(array('date_repeat', 'date_repeat_field'));

$field_name = 'field_event_date';

// Add the new (for date_repeat_field required) rrule column to the field database tables.
$db_column_rrule = array(
'type' => 'text',
'not null' => FALSE,
'sortable' => FALSE,
'views' => FALSE,
);
db_add_field('field_data_' . $field_name, $field_name . '_rrule', $db_column_rrule);
db_add_field('field_revision_' . $field_name, $field_name . '_rrule', $db_column_rrule);

// Load the field information.
$field = db_query('SELECT data FROM {field_config} WHERE field_name = :field_name', array(':field_name' => $field_name))->fetchAssoc();
$field = isset($field['data']) ? unserialize($field['data']) : FALSE;

// Change the field setting.
$field['settings']['repeat'] = 0;

// Save the field change.
$serialized_field = serialize($field);
db_update('field_config')
->fields(array('data' => $serialized_field))
->condition('field_name', $field_name)
->execute();

// Clear caches
field_cache_clear(TRUE);
}