It would be helpful to know what information you are using. But, failing that knowledge, I'd suggest that the instructions are telling you to change to the /etc directory, where configs of all kinds are kept (except the user specific configs in the user's home directory as hidden files [files preceded by a dot in the name]).
From the command line, to change directory, use the command cd: as in 'cd /etc' to change from whereever you are in the directory tree to /etc directory. To edit the contents of any file in /etc, you must have superuser (root) authority.
If editing from the command line, using a text editor such as vim, do this.
Enter the command: su (to switch user). You will be prompted for the password of the user to switch to. Enter the root password.
As root, start vim to edit a particular file: vim <filename>.
If you are not familiar with vim, there's another technique which will allow you to use a GUI editor.
While still logged in as user, enter the command 'xhost +localhost' to grant another user to use the GUI environment of the user. Then su to root. Then start a GUI editor. Something like '/usr/bin/kwrite' or whereever kwrite is on your system. When the editor is up and running, edit the file of interest, save and quit. Enter the word 'exit' to exit root authority, and you're done.
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