Hello! Thank you for contacting JustAnswer.com; I am Russell H., an Expert here at JustAnswer.com, and I will do what I can to answer your question as well as it can be answered.
I'd like to try to help, but I need to ask first:
What account (with whom, with what website, or machine maybe?) do you need to update?
What happens when you enter your old password ***** former password? or what error message do you get?
I have no power to make that check myself, from where I am, I'm sorry to say.
Try going into your Amazon.com account as usual, browsing for a book they have that you want, and seeing if you can buy it. (If that's what you use for buying, of course...)