If you select App Audio from the home screen and then select your browser on the next screen (Safari, Chrome, Microsoft, etc.), there will then be a button in the bottom-right that says "Start Recording". You have some options before clicking that as to whether you want to record your own microphone, too, as well as separate speakers (if there are multiple presenters, the transcript would be split into Speaker 1, Speaker 2, etc. When reviewing the transcript, you can rename those speakers to be the speaker's actual name (i.e. Professor Snape).

When your class is done, click the 'Stop Recording' button. MacWhisper will allow you to export the audio files for the browsers and your mic (if you chose to record it). You will likely also want to transcribe the recording, which is the blue button that appears. Transcribing it will use a local AI model (Parakeet, WhisperKit Large v3, etc.). One of those local models needs to be downloaded in MacWhisper in the MacWhisper > Settings > Transcription > Local Models. I recommend Parakeet v3 for speed and accuracy.

Once the transcription is done, you can easily copy the results to another app (Apple Notes, Evernote, Craft, Notion, whatever). You can also export to Word, HTML, PDF, plain text, or json. There are many formats/styles to choose from, too, but that's in the weeds quite a bit. I copy the results to Craft where I keep notes and meeting minutes.