From Joomla! Documentation

This page is a translated version of the page J3.x:Disabling user registration and the translation is 50% complete.
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User registrations are enabled in a default Joomla! installation. However there might be cases where you use extensions as a replacement and wish to turn off the default Joomla user management. To do this you must perform the following steps: Help3x-Users-User-Manager-Options-modal-window-en.png

Navigate to Users  User Manager then click on User Manager. Once in User Manager Screen, click on 'Options' Toolbar button to show the options page for users. Toggle choice yes|no next to Allow user registration, then click save.