To change the order of your articles, first be sure that you have filtered them by category. Once you are in the correct category, click the "up down arrows" at the top of the first column in the article manager.

After you click the "up down arrows", the articles will arrange themselves into their current order. The dots in the left column beside each article will become darker. Hover over the dots and your curser will turn into a bullseye. Now you may drag and drop your articles to re-arrange them.