Once you have entered your project details and storyline information, the storylines window will display your storylines and an initial column. A column represents a time point, and each storyline may have a card within a column, but you cannot have multiple cards on the same storyline and in the same column.
Try adding a new card, using Edit | New Card menu item. It will be placed in the first free location. You can also add a new card by right-clicking and selecting New Card, or by holding down the control key and right-clicking. These last two methods will create a card where the mouse pointer is; if there is no free space at this point, a new column will be inserted.
Left-click on a card and type some text into the card editor above the storylines window. The text will be displayed immediately in the card. You can also edit time and location, and add an annotation. Cards with annotations are displayed with a yellow triangle in the top-right corner.
If you wish to edit the text in situ, for example because you've hidden the edit window to make more space for the storylines window, you can select View | Edit in Place, and now when you left-click on a card, a text control will appear in the position of the card. To stop editing, press Escape or click on another window. You can only edit the card description in situ.
Go to Step 3 to learn how to move cards around.