To add an input pin, output pin, or value pin, do one of the following:
- Right-click an action.
- Choose NewInput Pin (or: Output Pin, or: Value Pin) on the context menu.
Result: The created pin is added to the target action as a square. Note that the pins are attached to their actions, and can be only dragged along the action borders.
Alternatively:
- Open the Tool Palette.
- Choose the appropriate button, and click the target action.