How to Hide Shortcodes for Font Awesome Admin Menus

function plt_hide_shortcodes_for_font_awesome_menus() {
	//Hide the "Settings → SCFA" menu.
	remove_submenu_page('options-general.php', 'shortcodes-for-font-awesome');
}

add_action('admin_menu', 'plt_hide_shortcodes_for_font_awesome_menus', 11);

Where do I put this code?