Difficulties for the high registration

I created a high page registration and from which I’m testing for new users. After initializing me it indicates that the user is in use and that I should find another that is not reserved.

The fact is that if I enter the back-end testing these high if they have been given by good although the message quoted above denote the opposite.

On the other hand, I do want to know that once the user has been discharged to be given notice whenever there is news on the blog.

Regards

https://wordpress.org/plugins/wp-members/