You have PB installed …right?
then you can use:-
/rcon pb_sv_kick XXXXXXXXX (where XXXXXXXX = player name)
/rcon pb_sv_ban XXXXXXXX (where XXXXXXXX = player name)
You can do this by either their name or slot/client number.
To get there slot number use /status in the console.
Give the guy a break fellas, and help him out… RTFM, is not always that helpfull.
If this proves to be to difficult m8, just download ASE (All Seeing Eye). Add your server details to it, and you can then view who is on your server i.e player names lists, without firing up ET. Provided that you have inserted your RCON password, you can simply right click the players name and hit “BAN” on the drop down list.