Step by step guide for a noob?

[Conir]

I've been looking at that page and I understand that I need the first 512 Bytes from my encrypted USB but I can't seem to get dd to work any tutorials on it all start off with C: --list to find the location but that does nothing on mine for some reason. I'm not sure if I have the correct dd downloaded or what, also in the tutorials everyone seems to run it from cmd and I can't get it to run from there but opening it directly opens a cmd like window.
I think I've a newer version of it and it opens it own cmd I just can't figure out the commands or get any useful lost of them 🤦