Enterprise Manager

I am confused about how to configuring OEM GC to utilize auditing and may not be asking the proper question. For example, if I wish to monitor failed login counts and create an alert to notify me, must I turn on auditing in the database first? I guess what I am asking is based on the tem,plates provided. Is it merely enough to enter values for the various events or must I do something further to turn them on? I realize the question is vague but that is a function of my understanding.
Thanks.