I appreciate everyones help. I used the etcher program within PureOS. I am super stoked about installing my new m.2 drive. I will need a small ram type screw to bolt it down.
I will need to buy a screw or two tomorrow.
Quick question: I purchased my Librem15 with an SSD. As I am switching drives, does the SSD have a small laptop screw that holds it in place? If so, I will use it. I do not plan to put the 500GB drive back in. I use the m.2 drive I just bought.