You can assign folder permissions to an author when you add or edit an author. Explicit author permission assignments of this nature take precedence over any group permissions that were assigned to the same folder.
To assign/remove folder permissions to an author:
Log in as an administrator.
Make sure you are working online.
On the Administration menu, choose Manage Authors.
Click Add new author or click Edit selected author.
Click the Permissions tab.
Click Add and select a Library folder (you can also make a new library folder).
A default permission is automatically applied.
Click the Permission cell and choose a permission from the list.
Repeat these steps to assign as many permissions as you need.