how to edit category page

It’s sometime theme dependent, however there are some generic solutions here :
https://pagely.com/blog/create-wordpress-custom-category-pages/

If the theme follows the Template Hierarchy :
https://developer.www.ads-software.com/themes/basics/template-hierarchy/
https://codex.www.ads-software.com/Category_Templates
you can create custom templates based on your category.

The process is well described here :
https://www.wpbeginner.com/wp-themes/how-to-create-category-templates-in-wordpress/

If you go on the website and click on customise, you will have a section on woocommerce. All the settings will be under here.

Are you using WooCommerce? Its product categories are not the same taxonomy as post categories. WooCommerce introduces its own templates for product related content. While it’s possible to override its templates, doing so makes ongoing maintenance more difficult. Where possible it’s better to make use of numerous hooks available to make customizations.

WooCommerce has their own dedicated support forum where you can get more specific advice.

If not WooCommerce, other e-commerce plugins may or may not have a similar setup. If your product category display does depend upon theme templates, everything corrinarusso said earlier is applicable and well stated.