I’ve summarized the steps for recording your screen using Mac’s QuickTime Player.

Preparation

Connect Sony’s USB microphone to your Mac.

・Amazon.co.jp： SONY Electret Condenser Microphone PCV80U ECM-PCV80U: Musical Instruments

Recording Screen with QuickTime Player

1. Launch QuickTime Player
2. Click [File] - [New Screen Recording]
3. In the [Screen Recording] window, select UAB-80 from [Microphone]
   
4. Click the red circle recording button
5. A message saying Click to record the entire screen… will appear
   • Full screen recording: Click
   • Partial recording: Drag
6. Click the ■ button in the menu bar to stop recording
   
7. After stopping recording, don't forget to save the file with Command + S

That’s all.

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Reference Information

・How to record computer screen with audio using Mac’s standard software QuickTime

That’s all from the Gemba.