To add a constant, that is the starting point of a function scope:
Select Constant > String or Number.
Drag the widget into a blank canvas.
You can also right-click a blank canvas and select Add Constant.
Click OK to place the
constant.
This creates a new function scope container where the constant is the
starting point. As the constant is a starting point, it cannot be deleted.
To remove the starting point, you must delete the whole function scope
container by right-clicking the function container and selecting Delete.