• To extend a path you've already drawn, use the Selection tool and click on one end of the path.
• The selected point is highlighted*.
• Then select the pen tool.
• Click on the selected point with the pen tool, then continue your path.
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This step is not actually necessary. You can take the pen tool and click directly on an endpoint to continue the path. However, selecting the point first makes it easier to see where you will be clicking with the pen tool.