how to scroll notes in presenter view on macbook pro for Keynote?

Move the mouse so the pointer is over the notes pane

if using an Apple Magic Mouse; run your finger down the back of the mouse

if using a mouse with a scroll wheel; move the wheel

if using a mouse with no wheel; move to pointer over to the left of the notes pane and drag the slider up or down

Apologies, I should have said: if using a mouse without a wheel; move the pointer over to the right of the notes pane which will reveal the scroll bar, then drag the slider up or down.