Removing SSO and Changing Associated Email Addresses

We have recently been purchased by another company.  We will be getting rid of our email server/service and will need to change the email associated with our users' Zoom accounts.  I have looked through various help files, I see where to disable  SSO but I do not see how to do everything.  We can manually setup passwords and change emails from the admin side on the Web, we do not have many employees.  The users will be using their new email address which we do not manage.  If there is a better chat for this question, please let me know.