I've installed the Numinix Extra Fields add-on and was successful in getting the extra fields to appear in the admin product creation page. I opened the shop's database and have seen a sample extra field in it that was created with the Numinix Extra Fields application.

The problem I'm having at this point is that the field's values are not writing to the database.
When I return to the product creation page, the values I entered previously do not appear either (apparently because they were never really written to the DB).

I spent several hours trying to get the data to show up on the product page in the store, only to later find there was never any data in the DB to display. This has become a real mess. Perhaps I need a developer more than I need an answer to this DB problem. Either would be appreciated. Thank you.