Sorry you had to cancel your trip. As long as you cancel the
DVC reservation at least 31 days prior to arrival, the points get returned to your account without penalty. You do not have to rent the reservation you already have to recover your money.
To add to what Chuck posted -
You can use the DIS R/T Board to offer to rent points for any dates.
DIS R/T Board rules allow you to solicit requests for any dates and then make the reservations for the dates requested.
The rules do not allow you to first make a reservation and then solicit requests for specific dates, unless the dates are 30 days or less away.
Bottom line: To use the DIS R/T Board, the rental request has to come before the reservation is made.
Remember that if you use the DIS R/T Board to offer a reservation more than 30 days away by any means, which includes via PM, email or posting in another poster's thread, you could permanently lose access to the R/T Forum.