Create a bootable Windows installation drive using Sandisk USB3.0 64GB?

Hi. I hope you still use these forums, or someone sees this and can help me. I went through the steps rickyjim listed to create a bootable USB, but now I can’t find the drive in Windows. I don’t know anything about code. How do I assign letter=N to the drive? I inputted that line after selecting the USB again but it just says “There is no volume specified. Please select a volume and try again.” This isn’t my USB and I worry that I screwed it up.