How to Hide WebinarIgnition Admin Menus

function plt_hide_webinar_ignition_menus() {
	//Hide "WebinarIgnition".
	remove_menu_page('webinarignition-dashboard');
	//Hide "WebinarIgnition → WebinarIgnition".
	remove_submenu_page('webinarignition-dashboard', 'webinarignition-dashboard');
	//Hide "WebinarIgnition → Webinars".
	remove_submenu_page('webinarignition-dashboard', 'webinarignition-dashboard&webinars');
	//Hide "WebinarIgnition → Create Webinar".
	remove_submenu_page('webinarignition-dashboard', 'http://127.0.0.1/wp-admin/admin.php?page=webinarignition-dashboard&create');
	//Hide "WebinarIgnition → Settings".
	remove_submenu_page('webinarignition-dashboard', 'webinarignition_settings');
	//Hide "WebinarIgnition → Opt-in 4 success 1".
	remove_submenu_page('webinarignition-dashboard', 'admin.php?page=webinarignition-dashboard#opt-in-box');
	//Hide "WebinarIgnition → NEW Built in Meeting".
	remove_submenu_page('webinarignition-dashboard', '__integrated-meeting');
	//Hide "WebinarIgnition → Support".
	remove_submenu_page('webinarignition-dashboard', 'webinarignition_support');
	//Hide "WebinarIgnition → Webinarignition Grid".
	remove_submenu_page('webinarignition-dashboard', 'webinarignition_grid');
	//Hide "WebinarIgnition → Changelog".
	remove_submenu_page('webinarignition-dashboard', 'webinarignition_changelog');
	//Hide "WebinarIgnition → Affiliation".
	remove_submenu_page('webinarignition-dashboard', 'webinarignition-dashboard-affiliation');
	//Hide "WebinarIgnition → Upgrade".
	remove_submenu_page('webinarignition-dashboard', 'webinarignition-dashboard-pricing');
}

add_action('admin_menu', 'plt_hide_webinar_ignition_menus', 1000000000);

Where do I put this code?