Folder permissions may be set by the  Group Administrator. To set folder permissions click the “Group Administration” button, then select the tab for “Folder Permissions”.

To add or update permissions on a folder just select the folder and your user list will appear.  From this point you select who you want to “View” only, or have “Full Control” or have “No Access” at all to this folder, for each of your members, and click “Update”.

Here’s a short video that walks through the process of setting permissions for an account.