You can edit your email address, password and postal address on your account details page. If you are not already logged in, you are asked to do so first.
If you've forgotten your password, you can click the Forgot password link on the login screen, to get a password reminder sent to your registered email address.
To unsubscribe from the TomTom newsletters, click the unsubscribe link at the bottom of the newsletter then confirm your choice on the web page that opens.
You can also select exactly which type(s) of email notifications you want or don't want to receive by going Profile in your account details page.