实施Play游戏服务实时功能

Question

当我实施测验赛车，玩游戏服务时，我总是得到游戏设置失败可能是因为我不知道我怎么试着问金店但我没有回答，抱歉语法不好

这是我的代码：

// Start the script.  The main menu needs to setup the invitation
// manager in order to detect incoming invitations.
void Start()
{
    //there is no example about HOW TO DO IT,I REALLY CONFUSED !
}

1.and this is the readme but i dont know how to implement that, i really need HOW TO STEP BY STEP PLEASE ,

2.here is the source code that i try to build

我用c＃脚本，请帮帮我，