first get your server streaming here:
http://www.pbbans.com/account_application.php
http://www.pbbans.com/webtool.php
next setup the webtool. add these to your configuration file
pb_sv_httprefresh 30
pb_sv_httpaddr "216.6.235.32" //your ip goes here
pb_sv_httpport 8000 //port number, can be switched depending on your host
pb_sv_httpkey "password" // enter your password here
and then go into your logs, get his IP and do this ban
/rcon pb_sv_banmask iphere
ex: lets say my ip is 216.6.235.39
I would want to do /rcon pb_sv_banmask 216.6.235.