I need a recorder device?

[liamcrane]

Hi all i have a little problem, im trying to record the sound from a youtube video but everytime i try and record it with either audacity or sound recorder i get the message no audio recording device could be found, whats the cheapest option to get this sorted, i just wanna record a few things dont think i have a sound card installed but i do have a high def audio cable for my motherboard that is not plugged in

any ideas?

 

[Kae]

Orbit Downloader

 

[liamcrane]

do i not need a sound card to record audio? sorry for sounding a little dum its just i have never done any recording before