Back button is missing from top action bar during firebase authentication

I am using the built-in firebase authentication. the only thing I want to do is add the back button to the top action bar. But I don't know-how.

    List<AuthUI.IdpConfig> providers = Arrays.asList(
            new AuthUI.IdpConfig.EmailBuilder().build(),
            new AuthUI.IdpConfig.PhoneBuilder().build(),
            new AuthUI.IdpConfig.GoogleBuilder().build());

    Intent intent = AuthUI.getInstance()

    startActivityForResult(intent, RC_SIGN_IN);

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