How to Hide YellowPencil Admin Menus

function plt_hide_yellow_pencil_visual_theme_customizer_menus() {
	//Hide "Appearance → YellowPencil Editor".
	remove_submenu_page('themes.php', 'yellow-pencil');

	//Hide "YellowPencil".
	remove_menu_page('yellow-pencil-changes');
	//Hide "YellowPencil → Customizations".
	remove_submenu_page('yellow-pencil-changes', 'yellow-pencil-changes');
	//Hide "YellowPencil → Settings".
	remove_submenu_page('yellow-pencil-changes', 'yellow-pencil-settings');
	//Hide "YellowPencil → Custom Animations".
	remove_submenu_page('yellow-pencil-changes', 'yellow-pencil-animations');
	//Hide "YellowPencil → Import/Export".
	remove_submenu_page('yellow-pencil-changes', 'yellow-pencil-export');
	//Hide "YellowPencil → Go Pro!".
	remove_submenu_page('yellow-pencil-changes', 'yellow-pencil-license');
	//Hide "YellowPencil → About".
	remove_submenu_page('yellow-pencil-changes', 'wyp-welcome-screen');
}

add_action('admin_menu', 'plt_hide_yellow_pencil_visual_theme_customizer_menus', 11);
Where do I put this code?