I'll give you an example on how to play in Edit Mode:
-Go to the "instruction manual" folder and open (edit data) & (edit manual) links. If you can understand the edit manual link then you don't have to read further.
-Look through the (edit data) links, I like E05 & E33 girls, and train stage. So I will copy E5.player, E33.player & S10.stage to the desktop (the file names are located below their visual images)
- Rename the files on the desktop to the following: E5.player --> ED05.player, E33.player --> ED33.player, S10.stage --> EDS1.stage
-Then move the edited files back the game folder and confirm the replace notification.
-You will have those 2 girls and the train stage when you play in the edit level/mode.
-To make it goes back to default, just copy the files from the "EDIT" and paste them to the game folder. So you should not make any editing inside the "EDIT" Folder, do it outside the desktop.
-And you can have up to 6 different players in the edit-mode, pretty tough if you put all bosses in together.
Hope it makes sense. :3