How to change the category order in Wordpress.
http://www.yangilbert.com/how-to-change-the-order-of-categories-in-wordpress
Wordpress defaults to alphabetical order for the category list. Reordering is not an option in the default installation so you will either need to change the code or install a plugin.
The plugin (free) I have found that does the job is this one:
Category Order and Taxonomy Terms Order
https://en-ca.wordpress.org/plugins/taxonomy-terms-order/
I have also tested this plugin for SEO site speed purposes. You can see the results in the video, or in the article.
