I've just been reading some Forum articles which seen to indicate that such functionality does not yet exist. So, I am quite confused
As an additional note, the Forum posts that you have read are probably the ones that discuss an "ER" output. I suspect that the authors of these posts are using the term "ER" to mean something different from "Relational" (e.g. a view using the Barker notation).
NORMA uses an "Extension" to create a 5NF "relational view" of an object role model.
To enable the relational view, you have to right-click on the drawing surface and then click on the "Extension manager" option.
This will take you to a dialog box shown below.
If you click the checkboxes shown in the Extension Manager dialog box, a 5NF relational view of your object-role model will appear as a new drawing surface page.