In User Configuraiton,
Allow User Registration is set to Yes.
New User Account Activation is set to Admin
is set to Yes.

CB Configuration
Allow User Registration is set to Yes, independently of global site setting.
Require Admin Approval is set to yes
Require e-mail confirmation is set to yes.

Moderation
Moderator Groups set to Administrator. Make sure there is someone who is in this group.

http://sitename/component/comprofiler/registers.html