3.5mm to USB cassette transfer

I’m trying to convert cassettes to CDs using a 3.5mm to USB cable attached to a cassette player and my new MacBook Air respectively. My only input option with Audacity though is Built-in Microphone. How can I get Audacity to recognize the USB cable so I can import this cassette audio? Thank you!
Mac OS 10.8.2
Audacity 2.0.2
Downloaded via dmg

A straight 3.5mm to USB cable does not usually contain the necessary analog to digital converters and USB controller. Could you describe the make and model of the cable you are using?

See this page to check that your Mac actually recognizes the USB connection: http://wiki.audacityteam.org/wiki/User:BillWharrie/OSX_and_USB_input_devices

– Bill

Thanks Bill. I returned that cable for a 3.5mm male male cable. I’m about to try it out.