Unfortunately your email address is the one bit of account information which we are not able to change. If you need your account to have a different email address, you should create a new Havenwise account with the desired email address. You can then set up the new account with the same settings as the previous one.
If you have an active Havenwise subscription, please contact customer support and ask to speak to a human. We can then transfer your subscription to your new account.