How to install Opensuse Linux with usb without format your usb

MVI 6890 20-12-2015 6:39pm
Firstly, you should read this site https://en.opensuse.org/SDB:Create_a_Live_USB_stick_using_Windows
on the site they tell you how to create a bootable usb but they don't tell you how to make it run and let you install your Linux distro, this is what I do in this tutorial
here are steps
I want to install opensuse 42.1 with file
openSUSE-Leap-42.1-DVD-x86_64.iso
the most confused step is what we should do to tell the system to boot the right iso
I just type this line into the box, you should see the video to know where to tye
hd:/boot/openSUSE-Leap-42.1-DVD-x86_64.iso