Open a New Image with a transparent background twice as big as the graphic you are working on, so you have room to move it without running into the edge of the snow. This graphic is 318x312, so your new transparent image needs to be around 600x600.

Click on your "Fill Bucket".
Bring your snow.tub to desktop if you haven't already.

Choose the Snow from the Patterns in "Foreground Styles"

Click once to fill the 600x600, transparent image with snow. Save if you want to keep it for future work.

Bring the graphic you wish to animate to your PSP desktop.

Select your large snow pattern you just created and in the "Layer Pallet click on and drag a copy on to your graphic you want to animate. The snow will be automatically centered on your graphic.

Use your "Mover Tool" to grab a snow dot and move the snow straight up so that the bottom of the snow layer is just past the bottom edge of the graphic to animate.

Whatever direction you want your snow falling is the way to move the snow layer, straight down, down left or down right, but stay with the same direction you started with for all four frames. Grab a snow dot to move the snow about 1 inch (by eye) at a time.

NOTE: If you are moving down left or down right move in smaller amounts than 1" intervals - say 1/2" instead. It isn't going to really matter that much what direction you go in, unless you are looking at a spicific "dot" of snow :), then you will see the direction it's going.

Now move your snow in the direction you want about an inch. File, "Save Copy As" frame1.

Move the snow again in the same direction about another inch. File, "Save Copy As" frame2.
Do the same thing 2 more times saving a copy as frame3 and frame4.

TIME TO ANIMATE YOUR FALLING SNOW GRAPHIC

Open AS (Animation Shop) and go to File, Preferences. Make sure AS is set to these specifications for your files.

Click on the wizard:
Same as first image -
Opaque, white -
Centered - With the canvas color -
Yes, repeat the animation indefinitely - How long, 25 (can be changed as you desire later)

Add frames. Go to where you saved the frames and click on the last file you made, hold the shift down and click on the first one. This brings them into AS in the file order you need them to be in.
Click Next and finish the wizard.

Try your animation to see how it looks :)

To Optimize:
Create a new animation from the optimized animation IS checked.

Click on "Customize".

View and/or "Save As" your new snowing animation.

I hope you have enjoyed using my tutorial :)