macos – Configuration of Icloud on Mac – What password to use in the last step?

I've icloud off on my mac and now I wanted to turn it on. At first, he wants my Apple ID and my password, in the second step he wants my mac user password but in the third step he wants a password to unlock my mac.

To be honest, I'm not sure what password should I use in the last step – whether it's a FileVault password or maybe another word from past?

The screen of the last step looks like this (sorry it's in Polish)

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