It’s not in English, so it’s a bit of stumbling around for me. It’s probably not wise to post your admin user login info, as someone may log in and make unintended changes.
Try to FTP in and change the permissions on your config file so it’s 666, making it writable by User, Group, and Everybody. If that doesn’t work, then change it back to 644, only writable by User. If that does work, then try changing it to 664 (User and Group writable) and test it again.