Could be the graphical way isn't working because I'm using older video cards than you are and it doesn't work the same way.
As for the reason the second way isn't working, it sounds like you're trying to edit it as your regular user and not your root user. The xorg.conf file is owned by the "root" user and can normally only be changed by that user.
Do you know any command line text editors? I just
but you don't want to do that if you aren't familiar with vi.
sudo vim /etc/X11/xorg.conf
"Please edit your X configuration file (just run `nvidia-xconfig` as root), and restart the X server."
You could definitely do this. nvidia-xconfig should do exactly what I was trying to do with nvidia-settings automatically. Just make sure you
The "sudo" means "Super User DO" ie - run the command as if you were the "root" user.
If you want to copy text from the webpage try
This should attempt to open the config file in gnomes default text editor with root user privelages. This is a graphical editor and should be a lot simpler than learning a command-line editor on the fly
gksu gedit /etc/X11/xorg.conf &