Help getting to record from my decks and aux

Please can someone help me?
I have a DJM-850 mixer and I bought speaker wire to aux cable to send the mix into my laptop
I was advised to use audacity to record but there’s no option to choose to record from aux?
Thank you!

What is the year of your laptop? Which laptop (Air, Pro)?

All Macbooks made in the last few years do not have an Aux input.

Go to Apple (menu) > System Preferences > Sound > Input. Do you see an “aux” or “line” input?

– Bill

Any reason you decided to not use the USB digital connection?

Unless your Mac looks like this…

You don’t have a Stereo Line-In or Aux-In.

You can connect your DJM-850 REC OUT RCA connectors to a Behringer UCA-202 USB adapter.

The newer Macs scrambled the USB connection, but there are adapters for that, too.