Click 
on the Forum Administration bar, then click Sort Settings from the drop-down menu. The Sort Settings form opens. Now, you can set properties for how forums and topics are sorted in Forum.
Sort Forums by: Sort forums by several criteria: name, order, lock status, creation date, modification date, topic count and post count.
Direction: Sort forums in the Ascending or Descending order.
Sort Topics by: Sort topics by name, lock status, creation date, modification date, date of last post, post count, view count, attachments count.
Direction: Sort topics in the Ascending or Descending order.