Oculus Player Height

OculusUnityIntegrationTuscanyDemo went well.AllOk there. Very simple…
But after completion I found it impossible to interactively, in real time, adjust the “Player Height”
How would I approach this?
Is it “easy” for a beginner to assign some keys to move the Rift view up and down on this “Y” axis?
Or if not…Which tutorial should I follow. Been searching for yonks all over the net but having no success at all.