No problem
lsusb and lsscsi are commands, that can be invoked from a shell. Just simply open a shell/terminal and enter lsscsi
You'll get a list of the available scsi devices /dev/sda ....
To see, if the USB stick is correctly attached open a shell/terminal and change to root (su - )
Than enter the comand lsusb
This should display all USB related devices which where found by the kernel
If you can find the USB stick enter dmesg. Look at the output and scroll backwards. You'll finde something like new USB device found. From there the kernel should show how he map it to a virtual scsi device.
If something goes wrong, try search the forum. There're lot of entries, what can go wrong
Dirk