What are the possible registration options in WordPress (everybody can register, nobody can register, only some users can register)?
More specifically:
- can WordPress be setup so that only those users that are previously approved are registered?
- can registrations by users be prevented altogether so that all registrations are done by the administrator?
- can all readers who wish so be registered?
The “Settings > General” Screen has a checkbox for “anyone can register.” This answers your second and third questions – it depends on how that setting is set.
For your first question, that functionality is not built into WordPress. Perhaps a plugin like WP User Registration would suit your needs for this bit of functionality.
Good luck!