Each email address now has its own My VM account
Secondary accounts changes now have to be made via the My Virgin Media account for the secondary email.
Sign into the account here: https://www.virginmedia.com/my-virgin-media using the email address concerned and the current password. Once logged in click on Account Settings then Account details. You should now see the options to change password etc.
If that isn't available try https://www.virginmedia.com/my-virgin-media/forgotten-details/password
If no security answers have been set for the email address concerned then you will need to call in for support and select technical issues> email
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