Reverse the order of posts

I want to reverse the order of posts.
Theme show new posts are put up on old posts. I want the old posts put up on new posts. Can you guide me how to edit them.
Thanks you

Hi!
Our themes don't provide such feature. You would better try to find a solution on wordpress forum. Here are some instructions:

http://codex.wordpress.org/Class_Reference/WP_Query#Order_.26_Orderby_Parameters

, but we don't recommend you to change the order. It may cause a lot of probles.