You can manage registration-related settings by selecting the link titled New Registration Settings located under the Membership section. With the help of the settings on the page, you can manage and control registration-related activities. Let us examine the usage of each of these settings in detail:
If this is disabled, only administrators will be able to log in to the site. This setting is enabled by default and hence all users can log in.
With the help of this option, you can control the activities of users who are banned in your site. By default, banned users are not able to log in to the site and they will view the following message when they attempt to log in to the site.
If banned users are allowed to log in to the site then they will not notice any considerable difference until they begin to post a blog or thread. They will view a message as shown below when they attempt to submit a post