5 Configure The Network in Debian Etch Perfect Setup

Could someone explain how i cut save the file:
-----------------------------------------------------------------------
# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

# The loopback network interface
auto lo
iface lo inet loopback

# The primary network interface
#allow-hotplug eth0
#iface eth0 inet dhcp
auto eth0
iface eth0 inet static
address 192.168.0.100
netmask 255.255.255.0
network 192.168.0.0
broadcast 192.168.0.255
gateway 192.168.0.1
----------------------------------------------------------------------
I tried many keyboard shortcuts like CTRL-Z but it doesn't save the file what do i have to do to save the file

THANK YOU VERY MUCH FOR ANSWERING!!!!!!

 

Take a look here: http://www.howtoforge.com/faq/12_15_en.html