And i'd like to change that xorg.conf file so how would i go about that?
The file is in the directory /etc/X11. Directory means also "folder".
The first "
/" means the upper level of the directory tree. It is similar to "C:\" in Windows. Following the path you should find the file.
You have to edit it with
root privileges (administrator).
So open from the menu the file manager Dolphin (or another if you prefer) in root mode. You will be asked about your root password.
Find the
xorg.conf file and copy it giving it another name, let's say
xorg.conf.original . This is a back up. If something goes wrong you can always rename it to the previous name and the system will use it.
Now open the
xorg.conf file for editing and replace the lines between
Section "Device"
.
.
.
.
.
EndSection
with the lines copied from the link I posted.
Save the file, reboot and cross fingers...

If something is wrong you probably won't see the usual login screen but rather the system will ask you if it should repair the situation. Choose yes in every step an you
should be back to the initial state.
If not you can boot the machine from the LiveCD that you installed from and rename back the back-up file
xorg.conf.original to
xorg.conf, again with a file manager in root mode. You can enter the forum from LiveCD too.
