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You're looking at old version docs. Latest Data Modeler 3.1.3 Patch is just released. Download it here http://www.oracle.com/technetwork/developer-tools/datamodeler/overview/index.html
Here are some links with documentation, demos, examples etc.
Re: Data Modeler Tutorial
When you're displaying your Logical Model, you can use the double arrow >> button above the diagram to do an Engineer to Relational Model.
Alternatively you can right-click over the "Logical Model" node in the Browser tree and you'll find Engineer to Relational Model in the drop-down menu.