Hey there saerdnak,
Thanks for reaching out to the Apple Support Communities.
To get started, we do want to make you aware that depending on the Mac model, there would only be one or two sound ports on your device. Additionally certain sound ports may only support certain output and input devices.
For more details on connecting audio devices, and changing the sound input on your Mac, check out this link here: Change the sound input settings on Mac - Apple Support
Depending on your Mac model, there may be one or two sound ports. If your Mac has separate ports for sound input and output, the input port may use either a microphone icon
or a sound input icon
. If your Mac has only one sound port, it may have a headphones icon
or no icon at all. This sound port supports stereo output and mono input (such as a headset with a built-in microphone).
You can use your computer’s internal microphone, your display’s microphone (if it has one), your iPhone microphone, or an external microphone plugged into your computer’s sound port.
Let us know if that's able to help.
Have a great day!