Can't record with Audacity on my Windows 7 pc

I have a HP Pavilion pc that plays music just fine but when I downloaded Auadacity it doesn’t hear any sounds coming into the program. Just a sold record line appears.
Troubleshooter says a network cable is not properly plugged in or may be broken. I also downloaded the LAME that is associated with Audacity but maybe not the correct one. Any clues

Back up one step and tell us what you’re trying to do.

“I want to record…”