Unfortunately, Pivot Stickfigure Animator doesn't allow you to create a wall. For this purpose, you will need to use a third party tool like Paint. Open Paint, create a wall using the Pencil tool and then save it as .bmp, .jpeg, or .png file. After that, launch the Pivot Stickfigure Animator and from the File menu select Load Background. Open the file and then design the stick-figure animation you want. I suggest you check the second video tutorial from Google search engine for further information.