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Sorry, don't know how to help you. The URL  that you have provided points to your local machine.
Good idea. We will add validation for all object names. Stay tuned.
You'll need to create a junction table (Junction Table). Vertabelo supports physical modeling only. 
We've added printing (export to PDF). This feature is available for Basic, Premium and Company accounts. Just click on the "Printer" icon on the toolbar. Enjoy :)
Foreign key definition is a part of reference. Click on the reference to add/remove FK/PK column pairs. 

Here is a instruction how to create a reference: http://support.vertabelo.com/topic/438421-how-to-c...