Visit any ticket counter at any Disney World Resort theme park or call the Disney Reservations hotline at 407-939-6244 to speak to a Disney ticket agent about upgrading your passes.
Provide the agent with your name and contact information. Explain to the agent the type of passes you currently hold and which passes you'd like to upgrade to.
Pay the difference to upgrade your Disney seasonal pass. The price depends on your current tickets and your new, upgraded tickets. Disney accepts cash, credit cards and debit cards as payment. Note your confirmation number and keep it for your records.