if you go onto the site that sells the software there should be a guide on how to proceed
main thing is getting com port right and also that the cable speed is correct
for a newby i would suggest you connect cable to obd socket and usb on laptop and turn key to mar position ie lights on dash lit but engine not running
you can move onto live data once you familiarise yourself with everything
its best practice to always turn ignition off before removing lead
hth