"That username is currently reserved but may be available in a couple of days."

User registration is not working. The first time I tried to register, it seemed to work, but I did not receive any confirmation email with my password, etc.

Now when I try to register, it says:

"That username is currently reserved but may be available in a couple of days."

"That email address has already been used. Please check your inbox for an activation email. It will become available in a couple of days if you do nothing."

I want to delete the unconfirmed account so that I can try again. But in the WordPress admin panel, it doesn't show this user at all.