In the first (Host) box of Device Toolbar, choose “Windows WASAPI”.
In the second (Recording Device) box, choose the (loopback) input for the speakers or headphones you are using for playback. For example, Speakers (Realtek High Definition Audio) (loopback)".
In the third (Recording Channels) box, choose mono or stereo. Stereo may work better.
In the fourth (Playback Device) box, choose the Speakers or Headphones that you are using for listening. For example “Speakers (Realtek High Definition Audio)”.
Start playing the audio you want to record.
Press the big red Record button in Audacity.
If you are already using WASAPI loopback as above, please attach a sample of a few seconds in WAV so we can hear what it sounds like. See How to post an audio sample. Give us more idea what you are recording. Is it simply a web site? Or are you trying to record Skype or microphone and a web site at the same time?
It will probably help to drag Device Toolbar wider then you can more easily see the contents of each box. Drag Device Toolbar wider by dragging the drag handle rightwards (the handle is at the right-hand edge of Device Toolbar).
Or you can make the same choices at Edit > Preferences…, Devices section.