Please follow this detailed path on changing your login:
Log in under the registered email address https://app.integritynext.com/login (it includes the option "reset password").
! if it is not possible to log in under the old registered email, please contact IntegrityNext Support Team - support@integritynext.com.
Click "Invite Colleague" on the Assessments page, or select "Additional Users" under Profile Settings in the menu under your name.
Invite / add the new email address.
The added address will this way receive an invite message sent by 'support@integritynext.com'.
Follow the invitation link and register.
Log in via credentials of the new user.
Delete the obsolete email address via 'Additional users' menu.