I have DNS-325 with firmware 1.05b03 . I flash wordpress 3.0 add-on with wordpress4.2.3(DNS-325 wordpress Package v3.00_07272015_UA). When I want to edit wp-config.php, I just have no permission to edit it , also can't delete it. I login in it with a user who definitely have write permission. How can I do to write file to the wordpress folder ? thx