Photopaint 11 - Layer Photos

I have searched for hours and tried the directions but I can't figure this out. I have thousands of hours logged up on this prog, but I've never tried layering. Here's what I want to do:

BG layer = photo of a wall

Next layer up: Human shadow cast on the wall

Final layer: Human standing in front of wall

Normally i would just have 3 pics and clone the person and the shadow onto the wall, but I may need to resize or move the person and/or the shadow to get the effect I want. Can anyone tell me the specific steps for this? I will have the shadow and human pics on a transparent background unless that's not the way to go.

Thank you