How activate Privatemsg Module to all users?

I just enabled the Privatemsg Module in my Drupal 6. I would like to enable this module to all users, who join in the website. But the registered users cannot see the "Write new message a开发者_运维知识库nd Messages" link.

Why the Privatemsg is not active in users section ?

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Go to http://yoursite.com/admin/user/permissions and set the permissions you want for the privatemsg module to the Authenticated User role (or whatever role you're trying to enable this for).