ISP Ubuntu Server Permission error.

I'm on this page http://www.howtoforge.com/perfect_setup_ubuntu_5.10_p3

After setting up the root password I can't access the following directory:
/etc/network/interfaces

It says Permission Denied. Any suggestions? I'm new to Linux so go easy on me.

BTW I did set my root password. I did the following:
sudo passwd root

set my password

then:

su

now my command prompt looks like this:
root@server:/home/username# _

 

I'm sorry. The directions are not very clear.

http://www.howtoforge.com/perfect_setup_ubuntu_5.10_p3

All it says is to edit: /etc/network/interfaces
I thought I just had to run the command:
/etc/network/interfaces

However, I realized I had to use NANO to edit this.
Hopefully my assumption is correct

 

Yes consider my problem solved.

Nano is necessary in order to edit this file. The command is as follows:

Code:

nano /etc/network/interfaces