Looking for logging into the Show Button 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 Show Button site. After that you can login as usual with your login credentials.
https://developers.facebook.com/docs/facebook-login/web/login-button/
https://stackoverflow.com/questions/23155278/facebook-js-sdk-login-button-doesnt-show-log-out-when-logged-in
http://www.educationportal.mp.gov.in/slogin.aspx
https://www.joomshaper.com/forums/create-login-button
https://help.salesforce.com/HTViewSolution?id=000193146
https://books.google.co.in/books?id=N4NcDgAAQBAJ&pg=PA253&lpg=PA253&dq=show+login+button
https://books.google.co.in/books?id=wsLoYvEvOWQC&pg=PT386&lpg=PT386&dq=show+login+button
https://books.google.co.in/books?id=Tij2PAQHUiYC&pg=PA115&lpg=PA115&dq=show+login+button
https://wsvincent.com/django-user-authentication-tutorial-login-and-logout/
https://support.mozilla.org/en-US/kb/fix-login-issues-on-websites-require-passwords
https://github.com/magus/react-native-facebook-login/issues/288
https://books.google.co.in/books?id=g2nn_LLZzaQC&pg=PT489&lpg=PT489&dq=show+login+button
https://medium.com/the-react-native-log/building-an-authentication-flow-with-react-navigation-fb5de2203b5c