For folks using the MYW pre-paid dining option, it is part of a "package deal" and must include park tickets to be able to purchase the option.
If you are an annual passholder or FL resident, those are "room only" disocunted reservations, thus they are not eligibale for the MYW dining plan.
The DDE (Disney Dining Experience) card is a 20% discount card that has traditionally been available to FL residents only. This year, it is available to all annual passholders regardless of residency. For all AP holders, the cost is $50. For FL residents that are not AP holders the cost is $75. It is good at virtually all Disney owned full service and buffet restaurants. It is good at Counter Service restaurants in the AK, Pop Century and All Stars, as there are no full service restaurants in those areas.
You can not purchase the DDE card unless you are an annual passholder (they will verify it) or a FL resident.