Ban Control: You can control IP banning from this section.
If any of the site visitors are troubling you, you can just BAN their IP and stop them to accessing your site.
Managing and Adding Ban Control
From manage section, you can delete the IP if you want to unblock any IP.
From Adding section, you can add a New IP to ban and give NO-ACCESS to your site for the mentioned IP.
This will also keep spammers away from your site. Use it wisely.