DVC members and renters are not eligable for free dining. Free dining is only available to people booking directly through Disney paying full rack rate.
Free dining is a promotion Disney has had the past 3 years (I think) during the height of hurricane season, late August to late September. You have to purchase a package through CRO, the room is full priced (with some exceptions reported) and you must buy at least a 1 day MYW ticket. The dining plan is added at no additional cost. It is a package deal, DVC does not do packages at any time.