I can't get anything to change, and the numbers at the bottom of the screen are all 0 or not moving.
First make sure you have the finger sensors on with the DOUBLE-LATCHES over your FINGERNAILS. If you don't see any measurements changing in the measurement bar at the bottom of the screen you either don't have the hardware attached, don't have your finger sensors in, or need to APPLY MOISURIZER TO YOUR FINGERS.