Sweeten to taste with concentrate, then on top of that, add more concentrate until SG has increased by 0.003 to prime for the carbonation. One can of my local concentrate adds the perfect amount for sugar to prime a 5 gallon batch.
If you do not add more sugar for priming then the sweetening sugar will be fermented and your cider it will finish drier than what you sweetened too.
In all the states no door stands wider,
To ask you in to drink hard cider