Just came here to post the same thing as I made a lunch reservation at Crystal Palace & want to cancel the breakfast reservation. The website really stinks with finding your ADRs & trying to figure out how to cancel!
Go to the Disney website http://disneyworld.disney.go.com/. First log into your account. Then click on My Disney Vacation tab (this is located next to the "Welcome So and So" right under the Walt Disney World logo on the left hand side) and drag down to dining reservations. This will pull up the retrieve reservations screen.
Go to the Disney website http://disneyworld.disney.go.com/. First log into your account. Then click on My Disney Vacation tab (this is located next to the "Welcome So and So" right under the Walt Disney World logo on the left hand side) and drag down to dining reservations. This will pull up the retrieve reservations screen.