the next time you're sending someone money, go 
down to where it tells you where the money is 
coming from and click on "change funding 
options" That will bring up some bullets and you 
choose which credit card to use and click the 
button!

They don't like it, they gave me a whole page 
about how good it is to use your bank account 
and how it enters you in their drawing every 
time you use your bank account to send someone 
money blah blah blah, but it's doable!