If youre talking about the order of posts in a thread, such as this ... yes there is and its pretty simple , even I can do it ...
So let me try and remember ....
Go into your PROFILE
Click MODIFY PROFILE
Click LOOK and LAYOUT
Go down the list and CLICK on SHOW MOST RECENT POSTS ON TOP
That should do it ... Let me know if you have any further queries
Imi
xxx