There are a couple ways to change the order of how your WordPress coupons are displayed.
You can re-order your WordPress Coupons by changing the “Published on” date within the post editor.
Posts in WordPress by default are sorted by descending order.
If you want an even easier option, you can install the free “Post Types Order” plugin and drag and drop your WordPress Coupons post types around in any order that you want.
After installing the plugin click into “Re-Order” under “Coupons” and you can then drag and drop your coupons in the order you prefer.