You can't do anything until you create at least one record.
However, if you create a global field within that table and place it on a layout, that field is available with 0 records.
E-mail me and I will help you.
No, I changed the field to a global field and still couldn't enter the field...
It must be something simple... but ???
I am clicking NEW RECORD... no dice.
I am clicking in the field... no dice.
I am hitting TAB.... no dice.
Have you set the relationships so that records can be added by way of the relationship?