6al2 and nitrous

So. Hopefully some help. I've installed my nitrous express kit ..I now need to o adjust and retard timing. I have program and laptop ,drivers downloaded, but can't get laptop to connect with msd. I open msd graph or pro data prigram. And cant get anywhere else than just opening it. Thanks guts. Quick rundown. 440 .30 over hydraulic roller cam. .565 305 duration. 750 dp nx plate 150 hp jets 727. 3800 stall 4.30 grs 29.5 x 11.50 tires. Track link.Dart had ignition when I bought it. Some help would be great. Thank you