How to use Google

Could you please give me the way how to set up Google login. Where to go to get the data to enter the fields if I need use Google login.
I set up a Google Web app with keys, however when I test, after the site ask access google account, it redirect to a blank page
https://demo.crefox.com/trangdv/giaytot/wp-login.php?ywsl_social=google&redirect=http…..