The map above is your best resource. If you're letting DME take care of your luggage, all you have to do is take the train to the main terminal. Once you get off the train into the terminal, make a right toward the giant "B" then head downstairs; you'll need to go down a couple of floors as DME is on the 1st floor.
If however, you arrive late and DME cannot pick up your bags(which is usually the case for us), you'll have to head to your left after getting off the train. You'll head downstairs to retrieve your luggage from the "A" terminal. Once your luggage is in hand, head back upstairs and head over to that giant "B" previously mentioned.
To recap: No luggage, head to "B". If you have luggage, go to "A", then "B." See?
