How can I write the object repository for Facebook login?

Hello! Can anyone tell me how can I write the object repository for Facebook login? I have tried to write class or id at object repository and none of the options worked. //*[contains(@class, ‘abc’)]
I will insert a screenshot with the error. I can access the site, and the pop-up with facebook is displayed, I press login, but the test fails when I have to write the password.
Any ideas?