You need, at least, to be in the plugdev
group and, probably (can't hurt) the usbfs
group for UDEV to mount it automagically. You can use the usermod
utility to do this.
You may -- may -- need an entry in /etc/fstab
that looks like
#none /proc/bus/usb usbfs devgid=83,devmode=664 0 0
Note that the example is commented-out; you can stick that entry in /etc/fstab
and uncomment it if just the group add doesn't work for you. You will probably need to log out and log back in for changes to take effect and you may even need to reboot (probably not).
Hope this helps some.