nothing is recorded with Audacity

I installed audacity-win-2.1.0, but my voice or the sound of the song I’m playing cannot be captured, but when I hit the headphone’s microphone with my finger.
When I want to record through Windows in ASUS FX503VD - A laptop, poor sound is recorded, but nothing is recorded with this software.
Please advise that the problem is where the recording will not take place.

The current version of Audacity is 2.2.2 and is available via the Audacity website: Audacity ® | Downloads

I don’t understand what that means.