The way to “kick” someone
out of the control panel is to either change their password or remove
their user account. If you want to kick/ban users from a game instance
click the Status link for the  instance then the kick or ban link
next to the user you want to kick or ban. The kick/ban/ping/traceroute
buttons on the status page will not be available for instances whose
gametypes do not have rcon support.