Problem to view forms registration for anonymous user

This error indicates that the Config.IDS.ini file is malformed. That file should get recreated if it doesn't exist - so go ahead and make a backup, then delete the file.

two screens * URL for the one : localhost/wordpress_sauv/index.php?smartyDebug=1 * URl for the two : localhost/wordpress_sauv/2016/06/10/bonjour-tout-le-monde/?page=CiviCRM&q=civicrm/admin/setting/updateConfigBackend&reset=1

you need to provide access to the guest user/visitor and you can find all the permission in WordPress Access Control

CiviCRM » Administer CiviCRM » Access Control

For more reference please give a read https://book.civicrm.org/user/current/initial-set-up/permissions-and-access-control/

I guess this helps !!!