Sing into the mic. The metronome sets the grid; whatever pitch you hold in each subdivision gets written down.
Your fundamental, drawn against staff positions. Vertical lines are beats; darker ones are downbeats. Dots are pitches committed to the score; a red stem through a dot means it heard a re-attack and wrote a new note rather than tying.
Tip: use headphones, and watch Input RMS and Detector in the signal panel below while you tune these.