Hello,
Customers can’t post the blog posts. Read about WP user roles https://wordpress.org/support/article/roles-and-capabilities/
We would be grateful if you read the WordPress and WooCommerce plugin documentation first if you are new with WP and WooCommerce. Theme support is able to help you only with issues related strictly to theme settings.
Read begginer guide on how to create posts https://www.wpbeginner.com/beginners-guide/how-to-add-a-new-post-in-wordpress-and-utilize-all-the-features/
Regards
Regards