Access denied you are not an administrator

I created 3 zones in freedns and I can add more, I can edit them BUT am not allowed to delete zones and since I am stuck there it's causing issues on my server.

I get this message when trying to delete a zone - A general error has occurred. Reason: You are not an administrator. Access denied.    

I don't know who is the admin of that service.

I've check the same thing you've say. Seems that this is the way to block free service to maximum and only the first 3 domains you add.

If you got trouble, create another account for new domains

there is no any kind of limit, but yes you can't remove dns zone, but you can edit it according to your needs.
probably shortly in the future dns remove zone option will be added.

I wonder where do i see "limit of 3"... damn.
You're right Admin.