User account

Hello all,
I have gone through the user account documentation and followed it (I think). I could signup and data is created in Realtime database. However, I am unable to login. Also, how do I set the password? I could not find the input type for password in the Registration Configuration option. I set it to text, but then in the database it’s shown as plain text. Is the documentation incomplete or I am missing something?

I also noticed that I could sign up the second time with the same email address. How do I go about this issue? Thanks!