Go to the FutureYou website and log in to your account.
Click on 'Account' on the top right hand side of the screen to access your account preferences.
In the list of options on the left hand side of the page click on 'ADDRESS BOOK'.
Click on 'ADD NEW ADDRESS' to add a new address.
If you want this address to be your primary address for any active subscriptions make sure that you select the options before saving your address:
'Use as my default billing address'
'Use as my default shipping address'