Hello,
01. The default Shop page cannot be edited. There is no option to set the image carousel in the shop page.
Please consider using the Woocommerce builder of WoodMart allowing to create custom templates for product pages and other functional pages that are not editable by default. Woocommerce builder is the inbuilt functionality widget included in the builder you use on the site.
You can also read our detailed documentation about layout builder in the following link:
https://xtemos.com/docs-topic/woodmart-woocommerce-layout-builder/
02. Which carousel arrow you are talking about. Please send a screenshot of the carousel and page URL.
Best Regards.