Thanks for your response!
OK. I see how I did not explain myself well. What I actually want to do is change the renewals, etc. to a different wordpress.com login. i.e., the new administrator already has a wordpress.com login with her email affiliated with it. When I send her the emails with the renewal links, they don't allow her to change the credit card billing. I'm assuming this is because I did the previous credit card entry, so it wants me to change it somehow.
Hope that helps to clarify my issue.
I see posts by people who appear to have been in direct contact with wordpress.com support, but I can find no way to do that. Seems like it would save so much (of my) time.