Changing closed board to open?

[Femphysiques]

I have a board running 3.7.2. Currently one has to register before they can see the forums. How do I change that to allow the public to see the forums but not post or PM or be allowed to do anything but read post and threads unless they register. Thanks in advance.

ps
I actually set it up...but I forgot how/where. again thanks.

[Dismounted]

<a href="http://www.vbulletin.com/docs/html/usergroups" target="_blank">Usergroups and Permissions</a>

[Femphysiques]

Usergroups and Permissions (http://www.vbulletin.com/docs/html/usergroups)
Thanks:}