When you have touched down in Salzburg, make your way to the arrivals hall (making sure to grab your luggage on the way.)
Keep an eye out for someone with a sign with your name on it (just like in the movies.) This is your driver and they will take you to your transfer vehicle.
Alternatively, you may need to find the designated transfer desk. Full details and instructions will be on your confirmation, so if in doubt, check it out.