To change a product category in Wordpress please follow these steps:
1. Log into your Wordpress Dashboard
2. Navigate to your Products from the Wordpress dashboard using the left-hand side menu. See the screenshot below:
3. Find the Product Page for which you need to change the category.
4. Once you have opened the editor for this page, you can select as many categories as you would like for the product to appear in. Please see the screenshot below:
Please note: sometimes you have to scroll through the entire menu to find the category you are looking for.