When you press alt+ctrl+F2, do you see a login prompt? If so, log in with username and password, then make your changes.
hostname login:
Password:
% su
# cd to wherever
# vi xorg.conf
# exit
Then press Ctrl+Alt+Backspace to stop and restart the X server.
If you don't get the login prompt, what are you seeing?
Let me be sure that I understand you. Are you trying to enter the physical dimensions of your monitor, or the refresh rates?
If you are trying to enter the width and height in mm, the correct place for that information is in the "Monitor" Section, in the option DisplaySize:
Section "Monitor"
DisplaySize 403 302 # mm
...
EndSection
If you are trying to edit the HorizSync and VertRefresh options, I think that it is desirable to enter a range of frequencies (like 31.5 - 50), and not a single value (like 79).
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