Audacity won't switch over from Speakers to Headphones in the User Interface? Yeti is plug 'n play with MAC and PC systems and is compatible with Mac OS X (10.4.11 or higher), Windows 8 (incl. Navigate to File > Export > Export as MP3 (or WAV). If working from the Studio computer, save project and audio files to a flash drive or Google Drive. iMacs, use C-Media USB Audio Device on the Mac towers, use Logitech USB Headset (black headset) or C-Media USB Audio Device (tan headset) or the Logitech desktop microphone (AK5370). Alternatively there are commercial applications which can record computer playback to a file that is. You can use additional software to record computer playback directly into Audacity or can do so by using a connecting a loopback cable from audio out to the separate audio input available on some Macs.
Open Audacity and find the recording devices tab.