question

Hello I have a problem, how can you log in with the DisplayName? This is how I have it now:

    public void Login()
    {
        var request = new LoginWithPlayFabRequest();
        request.TitleId = PlayFabSettings.TitleId;
        request.Username = loginUsername.text;
        request.Password = loginPassword.text;


        // Request an PlayFab API übergeben
        PlayFabClientAPI.LoginWithPlayFab(request, OnLoginResult, OnPlayFabError);
    }