Is there Email Activation plugin?

Hi. I’m new grav user.
I would like to add Auth( Email activation) I’ve been looking for auth plugin but I could install some of them but I couldn’t figure out how to make secret page and attach to Auth system.

so I came here. and creat forum account I actually surprized that this is exactly what I want auth system via Email activation.

Could someone teach me which plug in should I use and usage.
Thank you.
ofcause I read readme text. I can turn on it but I didn’t know how to make secret pages.

Thank you.