I used the Display menu to change my resolution settings. Now I chose a setting too small by accident, but I can't revert because the screen is so small I can't click the append button to enlarge it.
Anyone know what I could do?
Edit a relevant config file directly. You can go to a text console screen from X with Ctrl-Alt-(1 through 6). Can't specify the file to edit since you didn't name your GUI environment.