How to create email confirmation on user register?

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I’m new at Corvid but i really need such feature on my page. I found such code on this forum:
(I couldn’t add here cause its telling me to remove links while links are removed…)
https://gist.github . com/olfu79/71261a8dab0bdb7bcf46c0ce3eccc623

But i totally don’t know where to add it.

My questions are:
Where should I add “client-side registration code”?
Where should I add “client-side post-registration code”?
Where should I add “backend code”?
How to get needed vaules for example for this line:

let email = ??? // the user's email address

Also can i make it without creating special register/post-register pages? It would be the best if it can fit in one lightbox given from wix…