There are a variety of ways of adding shapes.
To add a basic shape, you can use the Shape Tool found on the Home tab. It lets you insert a quick basic shape into your visual. Basic shapes include rectangles, rounded rectangles, ovals, squares, circles, and rounded squares.
Step 1 will be selecting a Shape drop-down menu, next you can simply click into your Work Area to stamp the selected shape.
You can add these symbols to your visual by dragging and dropping or clicking and stamping a symbol from the SmartPanel or Symbols tab onto your Work Area.
To locate additional symbols, choose More Symbols from the More drop-down menu in the SmartPanel or Symbols tab.