Automatically added bloggers

I'm currinig using version 3.8.14670 of EasyBlog. in Joomla Version 1.7.1 . I have noticed that all my users are automatically being added to the bloggers list. Is there a way to stop that from happening. I've been through the setting and I can't seem to find a way. I only want select user to have the ability to create blog posts. I'm planning to do a Joomla upgrade soon but I would like to know if I can stop users from automatically being added to the bloggers list before I upgrade to the next version of Joomla and EasyBlog.

Thanks

Jonathan