To fold the bike, follow these 3 easy steps:
(1) lower and tighten the seat post,
(2) release the center lever and fold the bike in half,
(3) release the handle bar fold it down
Here are some video demonstration:
Converting JZ88 to a trolley in 5 seconds:
Jz88 folding bike can be completely folded in 9 seconds. Practice this as home before going "public".
Unfolding the bike is as simple as folding it.
Here is an illustration of the folding and the three modes: