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Verifying authenticity of Debian CDs

I was trying to Verify the authenticity of Debian CDs on your website, but I don't see instructions that will guide me through the process (step-by-step).

Can you help and/or fix?
Thanks, Chris

P.S.  this was the site I got stuck on:

There is a lot of information, but no clear guidence. For example, do I install Debian first then look somewhere for the "fingerprints" 

I don't understand the use of this tool: "you should use the tools sha256sum or sha512sum to work with these."