Only receiving HD channels(Solved)

Almost up and running with a tbs 6220 using windows 8.1 but I can only get HD channels (6 of them) but digital/terrestrial channels won't open (160 of them). I would appreciate being pointed in the right direction - advancing years being a barrier to logic!
Also, is it possible to delete previous scans from the list in tbs viewer?
... and what does the 'favorites' box do that is useful?
Also, is it possible to delete previous scans from the list in tbs viewer?
... and what does the 'favorites' box do that is useful?