So I was looking at a question about forcing X to recognise video memory to achieve 1080p resolution, however when I finished the following piece of code:
Section "Device" Identifier "Screen0" VideoRam 1048576 EndSection
I don't know what to do. I tried to exit and save it but it told me "File and location does not exist" or something like that. What do I do? How do I save it? Here is the post I was looking at for answers.