Add User?

In the past, I thought I had the option to add users to my account, even though I'm on an older plan. However, i'm not able to add sub-users. Can you please clarify? Are you able to allow 4 sub-users under my old plan? 

I'm afraid it is not possible to add more sub-users since that option doesn't exist anymore and old users like yourself were grandfathered to keep that option as long as you keep the plan. New users have to subscribe to an Enterprise plan in order to have sub-user adding possibility.

Let us know if you have any further questions.

Thank you!