Hi Raka,
That page was just an overview of the EJB3 support, not really a tutorial.
For the latest release of MyEclipse, you can follow the updated EJB tutorial. Make not of the introduction which includes a link to the JPA tutorial, which is the way of programming entity beans in EJB3. When you create an EJB 3 project, you can specify JPA support. The tutorials should help you get started.
Let us know if you have more questions.