Julie from Ohio

I have a 2009 Corolla with the Navigation system. It include XM radio functionality which I'm trying to get established. In order to register, I need the "radio ID." The Corolla manual instructs me to find Ch000 on my radio and then it will give me an eight-digit number which is my radio ID. I've searched the FM and AM frequencies (it won't allow me to see the XM screen because I assume it isn't set up because I haven't provided the radio ID.) Does anyone know how to find Ch000 on my navigation-based radio system? It is a factory installed system. Thanks!