[SOLVED]problem with Dual-Monitors; missing file

[Kas_]

So I have two monitors and I've read up on how to get two monitors to work. Right now, I'm running lxde. Startx works fine with mouse and keyboard both working. Both monitors show the same thing. I want two extend the screen to the second monitor. How would I do that? I read here:
http://www.gentoo.org/doc/en/xorg-config.xml#doc_chap4
https://forums.gentoo.org/viewtopic-p-6947594.html#6947594

that it's possible. However, I don't have a 40-monitor.conf in my /etc/X11/xorg.conf.d
Actually, I did not have a xorg.conf.d but I copied one over from /usr/share/X11

Do I just make my own?

[Kas_]

figured it out. I had to make my own file.