Mariner Software StoryMill for Mac - Manual (Page 30)

Events
An event in the timeline is something that happens at a single point
in time but that may affect scenes across storylines. For instance,
in Treasure Island by Robert Louis Stevenson, the first man killed
on Skeleton Island by the pirates affects Jim Hawkinsʼ storyline
(because he witnesses it) and also affects Dr. Liveseyʼs storyline
(because he and the people with him hear the man die).
Click the Insert Event button (shown at top right) or simply right
click (control-click on one button mice) anywhere on the timeline to
add an event to the timeline. You will see the Event Inspector
window:
To save your event, type a name for it, optionally type a different
date and time, and click Done. The event will show as a blue line
with the name near the ruler (shown at right).Double click the name
to edit the event in the Event Inspector.
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Tip:
You can add events to the
timeline just by clicking
where you want them to fall!