Re: Really don't get how to set up the USB

Basically, you'll have to:
1. Plug in the USB device
2. Wait a few seconds
3. Enter the command

lsusb

And see if your device is listed, if yes, go to 4, if no...well, that's another problem
4. Enter the command

dmesg | tail

And find the device name associated with the usb (something like /dev/sda1)
5. Mount it using (something like)

mkdir /mnt/usb
mount /dev/sda1 /mnt/usb

You might have to change the syntax on any of those commands, or google "how to mount usb flash on arch linux" or alike

Good luck! ;-)