How to create a group for joomla user group

Hi there,

Thanks for joomailer powerful extension at first. And I have a question that how can I clarify which user is registered or manager or admin in list?

If create only one list, I add all the user in joomla to list, and can not find who is admin or who is manager. If create several lists like admin list, manager list and registered list. For joomailer plugin only can choose one list, it is difficult to manage there lists. For example, registered user unsubscribe his newsletter, works, manager unsubscribe his one, doesn't work because joomailer use registered list this moment.

Any suggestion? Thanks in advance, I need your help~~~~~

Cheers,
Kay