can't remove a photo album
i have an iphone 5. when i originally bought the phone, i uploaded pictures from my previous phone (from the backup file on my computer) and created a new album called "phone to phone". now it won't let me delete any of the pictures in this album or delete the album at all. when i "edit" the album or pictures, it only gives me to option to share them or move them - not delete them. when i sync my phone to my computer, i uncheck the box to sync any photos from my computer from the "phone to phone" folder, it says they'll be removed from my phone, but they never are. i'm getting incredibly frustrated because it's over 400 pictures and i really need that space for other things.
please help?
iPhone 5