also fedora OS seams to dislike the use of the "c" in the su command .The changes in fedora AND in Gnome over the last 2 years do not use the -c , but that command IS in a lot of very old'98 to just old`06 "how to's"
on THREE LINES
su - ( hit the enter button )
--- then type in the root password when asked ( hit the enter button )
gedit ( hit the enter button )
do not type " ( hit the enter button ) " into the terminal
after you type in the root password and hit enter the location that the terminal is open to WILL CHANGE and the > will become #
and depending on just how bash is set up it might also change color