Sound recording, Windows 8, Audacity 2.0.3

I have just purchased a new laptop, a Lennovo 780, 2182
When I go to a website and try to record sound from it, it goes via the speakers and the microphone, and of course I want it to go directly from the sound card to Audacity.
But I cannot make it do that.
I have done this: Right click the speaker in the lower right corner, choose recording units and chosen Stereo Mix as the standard unit.
And I have chosen Stereo Mix in the upper right corner in Audacity.
What more can I do?
I really hope that someone can help me.

You not only have to select Stereo-Mix, but you have to control which sound goes into the mix. I’m not a Windows elf, but we did write this up.