ITS EASY WAY TO ENABLE LOCK SCREEN STORIES..
*go to GALLERY
*Select any your WALLPAPER OR IMAGE or PHOTO in gallery
*Then click "SET AS WALLPAPER"
* AND Click for "LOCKSCREEN"
* AND FinallY shows "WALLPAPERS (OR)Wallpapers & STORIES
*CLICK "WALLPAPERS & STORIES
*Finally Ur enable the lockscreen stories
after How to remove a wallpaper ur set in lockscreen stories
*Turn SCREEN OFF
*press POWER BUTTON
*And you will see lockscreen stories images and FINALLY u will see "i" ICON
*Select the "i" ICON
*AFTER You will see the down right corner "Setting or Star ICON"
*Then ur going directly to lockscreen setting app and u will remove a wallpaper ur set before
SORRY FOR MY ENGLISH