The header cart and my account icons will be displayed automatically after you activate the WooCommerce plugin. Wishlist icon is enabled once you install and activate free YITH WooCommerce Wishlist plugin and compare if you install free YITH WooCommerce Compare plugin.
Cart and account links – you must setup the pages in the WooCommerce settings. Docs: https://docs.woocommerce.com/document/woocommerce-pages/
To edit colors or disable the header icons go to Customizer – WooCommerce – Header(Cart, My Account & Search)