Custom Post Type

I’m using Woocommerce and I want to use this widget to filter post_type=product. I’ve got it to work by editing the widget-archives.php,
before:
“WHERE post_type = ‘post’ ”
after:
“WHERE post_type = ‘product'”

That works great. But the default permalink still points to the root, https://website.com/2017/03
I need to change it to:
https://website.com/product/2017/03

Where would I do that?
Thanks!