Tips:

Try for 12 frames per second (Shutter button - first it will focus - then it will take the shot (clicking noise)
Use lights! They can help make your image clearer and eliminate unnecessarily shadows
Remove the memory card from the camera. Locate the memory card drive before putting it in the slot of the computer (it looks very similar to the C.D. drive)
Open the DCIM folder and identify which one contains your stop motion photos.
Make a new folder on your desktop and drag all your photos to it.
Zitraffer - 720x480 size - Export to Quicktime.
Open up I-Movie. Create a new movie. If you want chose a theme. Import the movie.
To use the green screen: Go to Preferences - Advanced. Switch to your timeline. Drag in your background above your movie.
Edit your movie. Drag to export.