Tap on “Account” and “Manage subscription” (in the Android app, you'll find "Account" in the menu located in the top left hand corner). From here you can select your new default delivery address. This will update all future weeks that haven't already been charged.
Please note: To create a new address on the iOS or Android app you'll want to use a mobile or web browser. If you'd like to update your address for just one week, reach out - we're here to help.