Looking for logging into the Kindle Id site and are not getting the correct working link for it? In such a case, you can use the links given here by searching your desired login page in the search box. If the page is present on our website then you will get all the links related to the Kindle Id site. After that you can login as usual with your login credentials.
https://www.quora.com/How-do-I-know-my-Amazon-login-ID-to-register-my-Kindle
https://www.amazon.com/your-account
https://read.amazon.com/
https://www.amazonforum.com/forums/devices/kindle-e-readers/475306-where-do-i-find-my-login-id
https://www.dummies.com/consumer-electronics/tablets/kindle/how-to-register-your-kindle-paperwhite/
http://www.informit.com/articles/article.aspx?p=2176258
https://forums.tomsguide.com/threads/dont-know-what-amazon-login-id-is.125181/
https://www.reddit.com/r/kindle/comments/6b7xqr/unable_to_register_kindle_paperwhite/
http://www.brucebnews.com/2010/12/be-careful-setting-up-your-kindle-account/
https://kindle.s3.amazonaws.com/UserGuide/Paperwhite_V2/Kindle_Paperwhite_V2_UserGuide_US.pdf
https://help.overdrive.com/customer/portal/articles/1481605-how-to-read-kindle-books-with-kindle-cloud-reader
https://help.gumroad.com/11167-buyer-faq/how-do-i-read-a-document-on-my-kindle
https://static.bhphotovideo.com/lit_files/250172.pdf