Default administrator password?

I wanted to try out the server edition for mac. I followed the instructions on the website but, when I connect to the server, I’m asked to login. I can’t change the user name since the field is not editable and its value is “administrator”.
Is there a default password?
How do I log in?
I tried the standard default passwords (admin, administrator, Admin etc) but with no luck.

Default password is no password.

I left the field empty but I still get the “Invalid username or password. Please try again.” message

Mystery solved. I was trying to make it load an existing .local/Manager file and it didn’t like it.
I changed the path flag and it let me log in