Oh, I thought you were having trouble with the "request microphone" action.
Which instructions are you reading? The canvas recording feature was moved to the Game Recorder object quite a while ago. So you need to use a different object completely to record the canvas. I'm also still not quite clear what it is you're trying to record: do you want an audio recording from the microphone (which User Media does), a recording of the game (which Game Recorder does), or both?