I ordered one of the BK APs online for my DH. Just clicked on the link, entered the code that has been posted, picked my shipping option (chose electronic shipping for $2), and gave my CC info. A receipt screen popped up with the info needed to pick up the pass at the park. Printed out this receipt and gave it to DH.
You need to take this receipt to Universal and find the Cygnus Entertainment ticket kiosk. You then swipe the CC used to purchase the pass (used for verification purposes only). You punch in the confirmation code on your receipt and the pass prints out. After receiving the print out, you must enter one of the parks and have your picture taken for the pass AP. Took DH about 1/2 hour to do all of this. He did not need the actual coupon at any point during this transaction.
As a side note, DH did not have to pay for parking. He showed the ticket confirmation receipt to the attendant who directed him to park in the passenger drop-off area. He was told that he could park there since he was only picking up his pass.