2006 X5 4.4I, navigation. non DSP Premium Pkg.

I have a serius antenna on the roof at the back and it says "Serius"

Does the dealer have to activate the serius satelite? I hit the "mode" button on the nav console but I do not see "Serius". I see radio, CD etc.

I realize I have to subscribe, but I do not know how to activate.
Any info PLZ.

Thanks.