First time that I'll have answered a "techie" type query so excuse me if it isn't worded correctly.
Open your "User CP"
Click on "Edit Options"
Scroll down on that page to find the "Thread Display Options"
There'll be a box where you choose "Oldest First" instead of "Newest First"
Save the changes and all should be well in the world........
I hope!
ATB
Ogri the trog