I have a username and password for my site for development purposes and now want to take the site live and remove the username and password for anonymous users. How do I do that?
Go to admin/structure/block and look for the user login block set Region dropdown to none. If you are using the default Drupal theme, it would be under sidebar first category
but users can still create new accounts from /user page. To disable this, go to
configuration -> people -> account settings -> registration and cancellation and set "Who can register accounts?" -> "Administrators only".