To manage a server, you must be an "OP". To become an OP, please enter your player name on our web interface in the "Admin" area. (Edit game configuration -> Admin)

If the server is running in Advanced Mode, the server needs to be stopped an class="highlight">andan> your player name needs to be entered in the ops.txt file.
One admin per line! (Edit game configuration -> ops.txt)

Now when the server is started, you will be an admin an class="highlight">andan> you will be able to kick/ban players an class="highlight">andan> give yourself items.
You will find a list of available comman class="highlight">andan>s <a href="http://www.minecraftwiki.net/wiki/SMP_Server_commands" target="_blank">herea>