For Admins and Moderators:
Once an email list has been created for you, you need to create an account on the mailman system (with the same email address that the list was configured for). Once you create an account you will be able to log in and manage your list.
Users do not need to set up an account on the mailman system to receive emails from a list. Users having an account on the mailman system is for accessing archives (which we do not allow) or changing their email settings, like digest mode etc... If you have users (not admins or moderators) that were logging into mailman 2, then they will have to also create an account. If you are not sure please reach out to