Could you please try again on next.nostrudel.ninja? It is a coming-soon version of nostrudel where several bugs have been fixed, try the 'Nostr Address' option to login with your name@nsec.app 

 I just chose nsec.app as provider, which choice gets registered. But beyond that, paste doesn’t work, nor does the keyboard stay showing for text input. 

 This is when trying to login to NoStrudel on Android. 

 Try your name on this screen https://next.nostrudel.ninja/?#/signin/address