Pringles Can Pinhole Camera Pringles Pinhole Camera Help Please!?

Pringles pinhole camera help please!? - pringles can pinhole camera

I make a pinhole camera Pringles:
http://www.exploratorium.edu/science_exp ...
the problems with the finished product
# 4 says that when the lid is transparent, I wax paper or tissue in order to apply it, I have no paper, waxed, so I put the tissue, but when is this over, the fabric covering the hole and see nothing but the substance but if I do not use tissues and above, the picture that I see when I look at the camera is not upside down.
What am I doing wrong? and how can I fix this?