...and it is the same one you've used for years?
Sorry about that.
We have decided to make our systems more secure for you - which means we no longer store or handle your login information. Instead, it is now handled in a super-secure fashion by one of Amazon's fully verified web services.
This means you have to change your password :-(
How to fix your password
Just click on the "Forgot your password" link beneath where you usually sign in.
Then you'll be asked to enter your email address (that you are registered with) and it will send you a link to that address.
You'll then get an email from email@example.com with the link inside it...
Click on that link and it will take you to a webpage where you can enter your new password (it could your re-use your old one if it is "strong" enough.
Once you've saved it, you can then log in.
Apologies once again for the extra work - but it is because we have your best interests (and privacy) at heart.