If you want to edit the joomla log-in module you can go to and edit: /modules/mod_login/tmpl/default.php
In my case I wanted to remove the option to register (without disabling the ability to register from Global configuration.
Remove or comment the following:
<!-- remove below to remove the register now option -->
<!–<li>
<a href=”<?php echo JRoute::_( ‘index.php?option=com_user&view=register’ ); ?>”>
<?php echo JText::_(‘REGISTER’); ?></a>
</li> –>
