Hi Kee Tong.. I'm the one who replied you one year ago. My bike also collecting dust. Lol, but plan to take it out again after I pump the tires.
@MH G., @Mohd Rafiq G
It's like learning how to ride a new equipment, have to learn how to balance and steer with the back wheel. I still have trouble going in straight line and steering sharply so I don't ride on pedestrian paths as too narrow. From my experience the kick off part is similar to riding bicycle, then it's about the balancing