GraphClick Help > Tutorial
To insert the image of your graph, you may either:
Most image formats, as well as movie formats are recognized.
If your screen is cluttered with windows so that it is hard for you to drag a file and drop it onto a document, you may want to use, while dragging a file, ⌘Tab or ⇧⌘Tab to switch between applications, or use Exposé (e.g. F11 to reveal the desktop). You can also drag a file onto the GraphClick icon in the Dock.