Private header on sky3ds+ orange button help

I was wondering if anyone can clear up some mysteries for me.

Firstly i have used gateway and currently have a sky3ds. I have extracted a header and used it to play online games before. Now i decided to buy a sky3ds+ for my little brother and that the template file is no longer needed on it and uses some new file system where it will create a .cfg and i am supposed to edit it by putting in my own private header.

Now the issues i am having is, how do i exactly find this special game key in...

Private header on sky3ds+ orange button help