Sound input

I am a new user and am having trouble getting Audacity to see the external microphone. It does not give me an option beyond internal microphone even though the settings on my MAC (Mojave 10.14.1) registers the external mike.

Have you given Audacity permission to use recording devices? (see: https://forum.audacityteam.org/t/no-signal-from-usb-turntable-mojave-solved/50763/6)