How do you remove the "user login" block? I know this is a simple question, but I've searched for way too long. 

I just want to remove the user login box so that all accesses to the site, apart administrator access, will be anonymous. We don't want users to create accounts on the system.
You may disable block on admin/structure/block page, but users can create new accounts from /user page. It's best practice disable creating new accounts by visitors.


For drupal 7 go to configuration -> people -> account settings -> registration and cancellation and set "Who can register accounts?" -> "Administrators only".
For drupal 6 go to administer --> user management --> user settings and set "Public registrations" --> "Only site administrators can create new user accounts."