Auto Nav Drop Down - Please Help!

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Hi

I am trying to implement a drop down menu to my navigation.

I have read thishttp://www.codeblog.ch/2009/04/concrete5-drop-down-menu/...

But still cannot get it to work, when I set as template it just adds the PHP code in.

I am so new to this! - How do i assign pages to a top level nav item eg...

About Us
Link1
Link2
Link 3

Hope that makes sense, and I really would appreciate as much help as possible.

I am using Concrete 5 locally using WAMP