I just called and added the parking pass to my reservation.
Just so you know, "AMY" at DC customer service told me that they have now changed their processes, and you no longer have to pick up a physical parking pass from DC. They supplied me with an Eticket by email for the parking pass that reads, in part, "Present the original Eticket and photo ID at any SeaWorld or Aquatica toll booth as you enter the parking lot. This Eticket is valid for general parking for one car or motorcycle for 14 days after first use at SeaWorld Orlando and Aquatica during normal daily operating hours".
So just print and present and you're done! Love it!