My new cat is almost 11 months old. His previous owner trained him to use the bathroom floor for pooping. I am trying to get him to use the litter box, but he doesn't seem to know what it is. Please, HELP

Put the litter box in the kitchen with news paper all around the kitchen when your caturinates on the news paper take the urinated newspaper place it in the litter tray and cover with litter.your cat should sense the urine in the tray and then start to urinate in the tray all the time,it worked for my sister