Past users should use their email addresses to access their accounts. If passwords are not remembered, there is an easy option for password reset. It is recommended that users have their browsers remember/retain the access information for their HAI accounts.
If you are trying to create a new account for an individual other than yourself, it is IMPERATIVE you verify with that individual about any existing accounts on this platform. Data from one account (especially payment) cannot be transferred to another account.
PLEASE NOTE: ONCE AN ACCOUNT HAS BEEN SET, THE LISTED EMAIL ADDRESS CANNOT BE CHANGED! It is critical you match the name on the account with the email address of that individual.