@NormaLB Just hit the "edit" button next to payment.
You can pick any card you have on file, add any card, even add gift cards from there.
They probably default to the Qcard because it's their card.
Amazon does the same thing.
Edited to add:
Perhaps your card is expired or maxed out and they are asking you to use the QCard because that's the only other card they have on file for you.