gallery

Hi, I would like to personalize the gallery. It seems that this code [photo-category category_id = "4" show = "4"] not working!? Also is it possible to do this on the home page, so that when I click on a category, shows the image only from this category, not all images like now ? And last :) How to add multiple image in photo gallery. It seems that now on gallery section shows only the featured image. Sorry on my English and I hope you understand my questions :) Regards,