Moderate posts ???

Is there way to moderate posts from users ?

I’m using P2 WordPress Theme and
even if I’m changing levels of registrated visitors, they are all able to post comments new posts, publishing directly into the blog.

I tried to desable “allow any registered member to post”, nothing changed.

I d’like to validate the publication of the new posts before showing to everybody, as admin, and respect the basics levels even if I’m using the P2 interface.