Installing Kali with Persistence script question

[IRGeekSauce]

I am following this tutorial http://docs.kali.org/kali-dojo/03-ka...nce-encryption, and I have a question about the script used to create the persistence partition.

This tutorial is perfect for me since my usb is also 8GB. This is the part of the script in question:

end=7gb
read start _ < <(du -bcm kali-linux-1.0.8-amd64.iso | tail -1); echo $start
parted /dev/sdb mkpart primary $start $end

My version will be kali-linux-2016.1-amd64.iso

Where am I typing this code, exactly? The tutorial doesn't specify where you are in terminal when typing those commands.

Thanks.