I'm not familiar with that kit. But if it's a sweetened cider kit, you may have sorbate as one of the ingredients that you add after fermentation. That means you can sweeten without fermentation restarting. But it also means that you can't bottle carb.
Take a look at the packages and see if any of them say "sorbate" or "potassium sorbate" or "conditioner" or "stabilizer". If so, then bottle carbing won't work if you add it.