Melodie is French, so she needs her system set to use a French (fr) keyboard, which has the keys coded (mapped) differently to a US (en_US) or UK (en_GB) keyboard. Texstar gave her the command to set that from a terminal, which needs to be done separately for every user - root, guest, whatever.
He also gave her the commands to set up xorg.conf, which is the configuration file for X, the GUI.
Does that help?