Sorry for late reply. I hope you have solved it, but if not you can change the URL and Handle by following these steps:
- Log in to Shopify Admin.
- Click on “Products”.
- Click on the product you want to change.
- Scroll down to the bottom and click “Edit website SEO”.
- Under “URL and handle”, change the URL/Handle to what you would like it to.
For example, if I sold an item and gave it the handle big-pink-flowerpot, this handle would show in the URL after /products/.