To change a user email address, login to your Admin dashboard and use the menu on the left of the screen to navigate to "Users", then "Manage Staff". Use the search function to locate the user in question.
Account Admins can only change user emails before the user has activated their account. Activated accounts have a green tick icon under the "Activated" column in the user table. To change an email address for an activated user, lodge a ticket with support.flourishdx.com
If the user has not activated the account, click on the user name to open the User Details page. Next to the email address, click "change", enter the new email address, and click the "Update" button.