To update your address, head to the Addresses page in your account. From there you'll be able to edit, delete, or update your address!

If you're trying to change the shipping address associated with an auction item, head to the Bids page of your account, then click on the item that you'd like to change the shipping address for. From there, you can scroll down and add or attach a new address to the bid!
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You could also send a note to the organization in the fulfillment center.

The link to the fulfillment center was sent by email after the auction ended, here’s an example of the email notification:

The fulfillment center for each of the auction items you won can be found by heading to the My Items page and clicking on the View fulfillment details for the item in question. That will take you to the fulfillment page, where you can type messages directly to the fulfillment contact at the nonprofit and choose the method of receiving your item!