Simple - you can apply it to an existing email field type or insert a new one, then in the field's properties click the check-box "Enable Email Confirmation Field".
if you can't see it, might be a cache issue, so clear your browser cache and refresh after you've done the upgrade to v6.
Shows as per this example: https://www.murraywebs.net/mf/machform/view.php?id=11749