How do I add and remove cards?
To add a card, click a white circle under one of the available sections (To Do, Doing, Done), type text and then hit Enter on your keyboard.
Click on a card to make changes. A popover window will appear on the right for editing the selected card.
You may edit the Card Title and Description from this window and also make other changes such as assigning people, adding a checklist, and so on.
A card may also be deleted by using Delete (or Fn + backspace for Mac OS) on your keyboard.