XM Radio ID

[esacfrank]

I have a new to me 2008 Denali XL and am trying to find the XM Radio ID so I can sign up. All that I can play is the demo channel. What is the magic button (S) I have to press to display the radio id?
TIA

 

[tsench]

there is a channel 1 which is preview turn the right knob to one click then hit the letter I and ya get the ID info