I had to de-register my Kindle Fire and after I re-registered it I can't add my Yahoo account. I keep getting the message "email address or password incorrect". The same thing is happening on my Verizon cell phone. It says it's the wrong user name or password. I know both are correct. I had changed my password earlier but have re-entered the new one with the same result. Amazon said it's a Yahoo issue. I'm not tech savvy enough to figure this out.