This function is IN the EDIT menu, but I cannot find ANYTHING on how to use it in the manual or a Google search! Help!

Go to https://manual.fotomagi.co/en:record_narration and you’ll find the info you need.

I didn’t find anything using the words “start dictation” in the Edit menu, but I do find “Record Narration Assistant…” in the Slideshow menu. When you choose that, you can select your input device and click on “Start Recording” to do your dictation.