How to Hide the "DH – Anti AdBlocker" Admin Menu

function plt_hide_dh_anti_adblocker_menus() {
	//Hide the "Settings → DH – Anti AdBlocker" menu.
	remove_submenu_page('options-general.php', 'dh-anti-adblocker');
}

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

Where do I put this code?