Before loading the film, the frame counter has to be set to the start mark, for it is not an automatic resetting type.
Charge the shutter by the push & pull operation and release the shutter to transport the number in the counter.
When the film is 36-exposure one, set the counter to the red-colored dot between "0" and "36", and when 15-exposure one, set it to the dot between "15" and "20".
Note: The frame counter on this is reverse-counting one.