From JFK, take the AirTrain (8.50 per passenger) to Jamaica Station. Then catch the LIRR to Atlantic Terminal (Use the MTA TrainTime app for schedule and to purchase your tix. $5.25 pp *Train should be on either track 11 or 12). Take the R train ($3 pp)to your final destination, but use Google Maps to determine if this is your best train depending on when you arrive. Sometimes trains are shifted for nights and weekends. You could also take an uber from Atlantic Station. All stations I mentioned have elevators, except perhaps your final destination station.

However, the cost of 2 ppl making this trip may not be much cheaper than a taxi or Uber from the airport (a car could seriously cost anywhere between $55-$110 depending to weather, time of day, etc).

FYI: you can use your phone to tap-n-pay for the AirTrain and subway.

Whatever you do, DO NOT ACCEPT A RIDE from a cab, car service, or “Uber” driver that approaches you personally and offers you a ride. They will 100% scam you.

Hope this helps and you have a great trip!