You can log into your account and change your details at anytime. Just changing the default address on your account WILL NOT change the address on your subscription. You need to log into your account, and click 'manage subscription' and then 'edit shipping address'. This is the only way to edit your shipping address for your subscription.  If you need to change your shipping address make sure you change your billing address too if you have changed your address with your bank! You can also change your card details in this section!
If you have any issues, give us an email: support@becauseracecarbox.com