You will not be able to do this using the SecurityAssist email password behavior.
you would need to recr5eate the functionality using a recordset and Universal Email.
You already have the form to type in the email address.
add a recordset to the page to query the users table. Set it to filter the emailAddress column on the emailAddress from element.
When you add universal Email to the page, set the trigger to the email Lookup recordset not empty.
When creating the message body, use the recordset to retrieve the password and user name.