Question about USB mice and X-Windows

[Phusion]

I have FreeBSD setup my Dell Inspiron 5150 laptop and can use
X-Windows fine. I am using GNOME. The laptop starts up with GDM and
then I go into GNOME. I have already gotten my mouse to work. I want
to use my USB mouse so I plug it in while in GNOME but doesn't work.
Also, USB along with USB mice are already compiled into the kernel.
Also, I'm not using moused. Do I need to change my xorg.conf file? Let
me know what I can do to use this USB mouse when I want after the
computer is running X-Windows.

Phusion