bought a used Tivo and no cable channels ?

Hey guys I am new to the forum and I just got my Tivo it is used I got the cable card activated and Paired. However I am only getting about 8 channels from the person who owned it before me I am confused :confused:. I called Cox and they assured me the card is activated and paired. How do I scan or Load the channels from where I live ?? My Tivo is also activated thru Tivo and I have a monthly subscription ....just no channels ...please help !!