V5s Setup help

Hi all, (newbie)
I have just purchased a V5S openbox, and desperately need help setting it up. I don't understand C & N Line.
My grandson said It could be benefical to me, given what I spend on a Satellite Service.
As my username suggests, the description is right.
I have BT Fibre Broadband.

Thanks in advance

aintgotaclue.
 
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