I don't think you can just refer to a table field the same way you would refer to a form field. For one thing, since tables typically have multiple records, there needs to be some way to specify which record's value you want for the specified field.
You could use DAO recordsets (or ADO if you have Access 2000 or later) to directly manipulate the table, find the record you want and edit it, all in VBA code.
