L on Nostr: I wanted to join Nostr Nests because it seems that a lot of professional or fun ...

I wanted to join Nostr Nests (npub1us9…q4g0) because it seems that a lot of professional or fun activities are happening there.
But in it's first page there's no login guide.
It's not clear what should I put in to enter. Is it my npub, nsec, a chosen name or what?
It does not ask me an info to let me in.
semisol (npub1226…grkj)