You can update your shipping address for each individual subscription on your account by first:
- Logging in to your Account Page
- Adding the new address(es) by clicking ADD under the Shipping Information section (but, you're not quite done yet!)
- Scroll down to the list of your Subscriptions
- Click EDIT next to the subscription you'd like to update, and assign the newly created shipping address to that order.
- You're all set!