There are three key ingredients to using that feature: excessive forward planning, good old fashioned stick-to-it-iveness and logging in above before you try that!
You aren't high enough level to submit. You need to be level 5, so try playing a few games or tournaments before tackling the task of running an event. Thanks for your interest!
© 2013 Riot Games, Inc. All rights reserved. Riot Games, League of Legends and PvP.net are trademarks, services marks, or registered trademarks of Riot Games, Inc.