Cut a viewing hole in the side of the box near the paper, then put a piece of white paper inside the end of the box near the viewing portal. Point the end of the box with the pinhole at the sun so that you see a round image on the paper at the other end. If you are having trouble pointing, look at the shadow of the box on the ground. Move the box so that the shadow looks like the end of the box (so the sides are not casting a shadow). The round spot of light you see on the paper is a pinhole image of the sun. Do not look through the pinhole at the sun! Look only at the image on the paper.