Valid point that there could be abit more explaination about gameplay.
Your "computer" device up front has symbols that are good / evil. If any symbols light up as evil (broken heart, devil horns, X, X eyes, or inverted cross) you need to accept the doll in hell. Otherwise if all symbols are good (heart, circle, plus, smile, and cross) you need to reject them.
Edit: I've updated the page with instructions aswell!