Looking for logging into the Sign In Devise 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 Sign In Devise site. After that you can login as usual with your login credentials.
https://qiita.com/kentosasa/items/a0500f2f21b33b29beb6
https://qiita.com/tobita0000/items/866de191635e6d74e392
https://github.com/plataformatec/devise/wiki/How-To:-Sign-in-from-a-controller
https://github.com/plataformatec/devise/wiki/How-To:-Allow-users-to-sign-in-using-their-username-or-email-address
https://techracho.bpsinc.jp/hachi8833/2017_05_09/39184
https://stackoverflow.com/questions/9342832/how-do-i-login-a-user-with-devise
https://stackoverflow.com/questions/39773890/how-to-remove-disable-sign-up-from-devise