1. Open file
2. Click 【 Direct Selection Tool 】 on the toolbar to select the path.
3. Click [Plastic Tool] on the toolbar (located in the Zoom Tool Group).
4. Place the cursor on the anchor point or path segment to focus on (that is, the point where the selected path segment is stretched), and then click. If you click a path segment, the highlighted anchor with a box will be added to the path.
5. Drag the highlighted anchor point to adjust the path.