GP only contains a small amount of icons for things like the Hamburger Menu, Back to Top, Search Icon, Woo shopping cart etc… but they are for the Theme use unfortunately. Anything in particular you’re trying to achieve?
Search icon displays when Nav Search is enabled in Customizer > Layout > Primary Navigation.
Tag icons automatically appear when a post has a tag. If there not showing then check the settings in the Customizer > Layout > Blog – theres options there to disable tags etc.