Your address book can be managed online by logging into your Onnit account and navigating to the Account Dashboard. A menu bar on the right side will have several options to choose from, including Address Book.
Here you can edit existing addresses, update an address to be your primary/default address on file, and delete addresses that are no longer applicable.
Please note, if you are updating your address and you also have a subscription, you'll need to also update your address by navigating to Subscription Orders on the menu bar.
For further assistance, feel free to contact help@onnit.com or call 1-855-ONNIT-99 to speak with a representative.