I have the same problem. I have read all previous topics but have no success in getting it working. where exactly do you paste the shortcode? You say post / page editor but i have no clue what you mean. the only editor my wordpress seems to have is the actual theme editor, and there are many template .php files in there. Please could you be specific as to which file must be edited.
After creating the shortcode you need to place that in page. Page can be created from wordpress Page menu in left side. From there you can place it. It is the same area where you keep content.