You should go to the command line terminal - in Mandrake, that's probably the programs Konsole
Here, you can change to the super user - also known as root
- by typing
You will be asked for the administrator password. Enter it, and you are root. You can then start the editor from the command line. That is probably gedit
. Once you have started the editor, you can open the file from the editor. Then the file will be edited with root rights, and you can save the changes.
You should use the su command to have administrator rights for short, specific tasks. You should not log in from the beginning as the super user/root/administrator.