Logon as Administrator.

Navigate to the "Administration" Module.

Click on the "Users" tab.

Select a user with an email that you have access to.

select "edit" next to the users email address.

You will be prompted to enter a new email address for the user.

Once the new email address is entered, a confirmation message will be sent to the new email address, along with a verification code and a link.

Click on the link, and enter the verification code you received in a separate email. You will be required to change your password as well.

The users primary email address has been changed!