I'm probably going to make myself look foolish here but I went the terminal route, typed in sudo nano /etc/apt/sources.list and put a hash on the correct line then entered ctrl-o and ctrl-x and I get this:
File Name to Write: /etc/apt/sources.list....*
(This is shown in white on black at bottom)
If I were to try to exit by closing the terminal it says "a process is still running."
*Do I put in the apt-get update in here?