Problem to get authenticated key

Hi,
I want to follow steps in this

https://www.digitalocean.com/community/tutorials/how-to-use-filezilla-to-transfer-and-manage-files-securely-on-your-vps

to get one Unique key. Can you please show with correct steps to create such Authenticated key through Filezilla or PUTTY?
LVL 12
HuaMin ChenProblem resolverAsked:
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Jackie Man IT ManagerCommented:
You need a real server to test the steps and it might be beyond the scope of asking questions as it is a bit time consuming to do it.

You just want to learn or is it a real task?

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