Event Suppression

I am trying to suppress a certain event from logging to the DB and console. I ran the event wizard and found out that this cannot be performed automatically by the wizard. I followed the Action Details that stated to edit the Prevention Parameter configuration. I created a Prevention Parameter, selected the Log Rules Tab, Add Rule, but there is no radio button "Ignore the event". I'm not sure where or how to filter off events. The instructions are not clear to me. There is nothing in the admin guide that talks about it that I can see. We are using 5.2.9 MP1 on Windows 2008R2.