“Sending these credentials via email”

I was only able to test the plugin and register a new dummy user in my role as admin (see my previous support request here)…

I had the “Sending these credentials via email” checked.
I did receive the email quickly, but it only shows username, not the password that he has chosen. How can i ensure that password is also sent in the email?

Additional question:
Is there a way to make it a default that an email is sent to a new registred user?
It should be automatic, just like it always happens when you create a new WP user. Is there a way to remove this checkbox from the form and ensure an email with credentials is always automatically sent to a new user?

Your help would be much appreciated.

The page I need help with: [log in to see the link]