Child Theme and hide designed by…

Thank you…but “This snippet applies to Customizr version 3.1.x and below. It may not work with version 3.2+.”
How can I do?
I can modify the function php?

Here is it:
<?php
/**
*
* This program is a free software; you can use it and/or modify it under the terms of the GNU
* General Public License as published by the Free Software Foundation; either version 2 of the License,
* or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
* even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
*
* You should have received a copy of the GNU General Public License along with this program; if not, write
* to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* @package Customizr
* @subpackage functions
* @since 1.0
* @author Nicolas GUILLAUME <[email protected]>
* @copyright Copyright (c) 2013, Nicolas GUILLAUME
* @link http://themesandco.com/customizr
* @license http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
*/

/**
* This is where Customizr starts. This file defines and loads the theme’s components :
* 1) A function tc__f() used everywhere in the theme, extension of WP built-in apply_filters()
* 2) Constants : CUSTOMIZR_VER, TC_BASE, TC_BASE_CHILD, TC_BASE_URL, TC_BASE_URL_CHILD, THEMENAME, TC_WEBSITE
* 3) Default filtered values : images sizes, skins, featured pages, social networks, widgets, post list layout
* 4) Text Domain
* 5) Theme supports : editor style, automatic-feed-links, post formats, navigation menu, post-thumbnails, retina support
* 6) Plugins compatibility : jetpack, bbpress, qtranslate, woocommerce and more to come
* 7) Default filtered options for the customizer
* 8) Customizr theme’s hooks API : front end components are rendered with action and filter hooks
*
* The method TC__::tc__() loads the php files and instanciates all theme’s classes.
* All classes files (except the class__.php file which loads the other) are named with the following convention : class-[group]-[class_name].php
*
* The theme is entirely built on an extensible filter and action hooks API, which makes customizations easy as breeze, without ever needing to modify the core structure.
* Customizr’s code acts like a collection of plugins that can be enabled, disabled or extended. More here : http://themesandco.com/customizr/hooks-api
*
*/

//Fire Customizr
require_once( get_template_directory() . ‘/inc/init.php’ );

/**
* The best and safest way to extend Customizr with your own custom functions is to create a child theme.
* You can add functions here but they will be lost on upgrade. If you use a child theme, you are safe!
* More informations on how to create a child theme with Customizr here : http://themesandco.com/customizr/#child-theme
*/

Well…in Child Theme I have the file style.css than I should copy the function.php of the originally theme and enter this:

add_filter(‘tc_credits_display’, ‘my_custom_credits’);
function my_custom_credits(){
$credits = ”;
$newline_credits = ”;
return ‘
<div class=”span4 credits”>
<p> · © ‘.esc_attr( date( ‘Y’ ) ).’ ‘.esc_attr(get_bloginfo()).’ · ‘.($credits ? $credits : ‘Designed by Themes & Co‘).’ ·’.($newline_credits ? ‘
· ‘.$newline_credits.’ ·’ : ”).'</p> </div>’;
}

??
Sorry and thank you