add content to .config file

[wahaha]

halo.... currently i had successfully installed a ndiswrapper-1.23 into fedora core 4, 2.6.11-1.1369_FC4 after installed 16K stack size.

Now i am trying to configure wlan0 interface and i found out one link as below:
http://www.linuxhomenetworking.com/w...ess_Networking


From the link, on the part of "Installing and Configuring ndiswrapper", step10:
10. You will always need to have a ndiswrapper compatible kernel for the application to function correctly. To maintain your current kernel during yum updates, edit your /etc/yum.conf file to exclude the kernel from being kept up to date with the exclude option.

#
# File: /etc/yum.conf
#

exclude= kernel




As well as on part of "Configure The New wlan0 Interface":


Edit /etc/sysconfig/network-scripts/ifcfg-wlan0 to include these new lines:

DHCP Version Fixed IP Version
============ =================

DEVICE=wlan0 DEVICE=wlan0
USERCTL=yes IPADDR=192.168.1.100
ONBOOT=yes NETMASK=255.255.255.0
BOOTPROTO=dhcp ONBOOT=yes
BOOTPROTO=static



I just able to read the file only and not able to edit or add informations to the file.
Did anyone have any ideas???
Your advices are much appreciated !!!

[rcgreen]

gotta be root to edit system files.