You can change the order article teasers are listed in on a category page by editing the the Publish Date of individual articles.
To have an article appear first on a category page, edit its Publish Date to the most recent date.
- Click Articles.
- Find the Article.
- Click Edit.
- In the Publish Date field, update the date.
If you're adding a collection of articles and want to manage the order of their appearance, then add the article meant to be last on the page - first. Continue to add and publish the articles in descending order.