Sirius Satellite Radio E.S.N. code?

Hi I have a 2008 Ford Expedition with the Touch Screen Navigation and I want to purchase a subscription for Satellite radio and I need my 12 digit ESN code. When I got to the Satellite tab it says to call a number to activate is there anyway I can find my ESN code so i can activate online? It doesn't work when I turn in to channel 0 and I don't have the owners manual. Thank you!|||Radio codes are 8 or 9 digits not 12. Channel 0 always works on every satellite radio. Are you sure the radio is Sirius equipped?