But as soon as you click 'Create new forum' button your forum goes public and your eager public go 'Ooh! a new forum, lets see what it's all about!'
Yes, you can set it as locked but then it can still be read.
Anyway, to cut a long story short...
to make your forums Private (ADMIN only) by default,
in admin/admin_forums.php
find
CODE
"auth_view" => AUTH_ALL,
"auth_read" => AUTH_ALL,
"auth_read" => AUTH_ALL,
replace with
CODE
"auth_view" => AUTH_ADMIN,
"auth_read" => AUTH_ADMIN,
"auth_read" => AUTH_ADMIN,
And there you have it.

