I want to record but with out a mic, how can I?

I would like to be able to record things that play out of my computer, but i don’t have a mic, and at school i was able to record things that play through the computer instead of mic, can someone please help me with this? I am asking because i can’t find sterio mix.

Windows Control Panel

Some of the current laptop models have removed the ability to record streaming sound. On Windows machines, I use Total Recorder to get around that.