You can fine-tune the lines and contours of a shape by adding, moving, or deleting its editing points. First you need to make the shape editable, as described in Making Shapes Editable.
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To add a point, make the shape editable, press the Option key, and then hold the pointer over the shape’s border. The pointer changes into a pen tip with a plus sign (+). Click the location on the border where you want to add a point, and then move the point if needed.
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To move a point, make the shape editable, click the point, and then drag it to another location. You can move several points at the same time by holding down the Shift key as you click multiple points, and then dragging.
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To delete a point, make the shape editable, click the point, and then press the Delete key. You can delete several points at the same time by holding down the Shift key as you click multiple points and then pressing Delete.
To learn about manipulating and aligning shapes, and changing their general object properties, such as color, border style (stroke), size, orientation, shadows, and more, see About Manipulating, Arranging, and Changing the Look of Objects.
To learn further details about modifying specific types of shapes, curves, and lines, see: