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Changing/Cancelling a bid

I would like to pay my offer with a credit card other than the one I submitted earlier. What should I do?
I need to change a flight for which I have successfully received an upgrade. Can I transfer my upgrade? If not, what happens to my upgrade?
I cancelled my original offer, but now I want to make a new offer. Can I do this?
I have received email confirming I have submitted/changed my upgrade offer which I did not.
I want to modify or cancel my offer, but the system does not allow me to. Why is that?

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