Best way to generate ER diagram

We have Oracle 11g in our environment. I wanted to know which should be the best way to generate an ER diagram. Below are these steps in SQL developer (version of SQL developer is 3.2.x):
a) View → Data Modeler → Browser
b) In browser tab, select show on newly created relational model
c) Then just drag the tables you want (from e.g. the «Connections» tab) onto the model.
The problem is I am not able to drag the tables.
I hope I have been able to explain my requirement of generating ER diagram.
Please revert with the reply to my query.
Regards

2) If all the tables are required in ER diagram, then should all the tables be selected in point c) of my post.
If all the Tables in your relational diagram are to included in the ER diagram, just click the Engineer button.
If some are to be excluded, you can expand the Tables node in the tree in the top part of the dialogue and deselect the ones you don't want.  Then click the Engineer button.
1) How to save the ER diagram
To save your model for future update, you can go to the File menu and select Data Modeler > Save.
To save your diagram as a PDF or image file, go to the File menu and select Data Modeler > Print Diagram.
David

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