I saw another post from a couple of weeks ago on prepaid rates not being changeable. I recently lost money from a nonrefundable booking (I couldn't get to my destination because my flight was cancelled due to weather -- as were all flights).
When I look at the "rate details" on the prepaid rates, I see it says nonrefundable and no cancellations allowed after a short window, but I do not see anything that says you can't change the dates. In fact, in the rate details, right above where it talks about Cancellations, there is a paragraph that says "Modifying Reservations" that simply says changing the dates may result in a rate change. Where exactly does it say that these rates are not changeable?