1. Open Photoshop. Open Image to work with Pen Tool.
2. Select the first Pen Tool from Tool box.
3. Once you select the tool please turn your attention to the option bar below menus and select "Paths" (Middle one shown in the following figure)
4. Start making path using pen tool around the edge of the image. Close the path by clicking on the first point again.
5. Go to Path palette. If its not open, try
Windows > Path
6. Click on the(third from the left) icon "Load path as a selection" . The path will get converted into the selection.
