Looking for logging into the Raspberry Pi Admin 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 Raspberry Pi Admin site. After that you can login as usual with your login credentials.
https://www.raspberrypi.org/forums/viewtopic.php?t=45610
https://www.raspberrypi.org/documentation/linux/usage/root.md
http://d.hatena.ne.jp/dekovoko/20140508/1399544708
https://qiita.com/R-STYLE/items/b481ba2d695ddf8bcee4
https://qiita.com/kenchang/items/849c82f16ba5eafe070d
https://qiita.com/t0yohei/items/f5355f8c456d9cf64679
https://raspberrypi.stackexchange.com/questions/660/what-password-to-use-to-log-in-after-the-first-boot
https://jyn.jp/raspberrypi-username-change/
https://www.makeuseof.com/tag/raspbian-default-password/
http://www.fml.org/home/fukachan/ja/raspbian.password.default.html
https://howchoo.com/g/m2qwytdmmjn/raspberry-pi-default-username-and-password
https://matsudamper.hatenablog.com/entry/2017/01/05/020502
http://epsilon27.hatenadiary.jp/entry/2017/02/04/%E7%AE%A1%E7%90%86%E8%80%85%E6%A8%A9%E9%99%90%E3%81%A7%E3%81%AE%E3%82%B3%E3%83%9E%E3%83%B3%E3%83%89%E5%AE%9F%E8%A1%8C