Help! I can't find my device

Hi, I purchased the “super USB cassette capture” device and downloaded Audacity 2.1.2 onto my Mac OSX 10.9.5 and when I plug in the USB cable from the cassette player, nothing shows up. I am trying to convert old cassette tapes into digital files and am not able to connect to the cassette player. Can anyone help me? What am I doing wrong?
Thank you

Audacity checks for new devices when it starts. So either restart Audacity with the device connected, or Transport > Rescan.