Closing the window shows that the Attributes now appear on the E/R Diagram.
The asterisk indicates the Attribute is required.
The 'o' indicates it is optional.
A pound sign (#) would indicate the field is a Primary key. (don't enter those--see the paper for a fuller explanation).
Enter all the Attributes and you'll be done with the first draft of your Diagram.
Notice that I have no primary keys on any Entities, which means there are no attributes at all for the Associative Entities.