When Maritz unveiled the new website, I had to change many of my dates selected for the "Blue" gas stations. The only way I could do this was to call, not E-mail or any other method of communication. Asking calmly, I said that I needed to change the dates. The reply was that the only way they could help me was to remove those shops from my assigned list. The, I would have to go back to the list of available shops and self-assign them to new dates.
That is what I did, hoping, of course, that they were not snapped up by another shopper.