does anyone have directions on how to make rice krispy for modeling....

when you buy a box of rice krispies they should have a recipe for rice krispie treats. Thats the one I use

The recipe is on the box. You can leave out the shortening and just use marshmallows and cereal.
It gets pretty sticky so it's wise to put shortening on your hands when you start molding.

you can also go to their website. its on there