How to Hide LaunchKit Admin Menus

function plt_hide_launchkit_menus() {
	//Hide "LaunchKit".
	remove_menu_page('wplk');
	//Hide "LaunchKit → LaunchKit".
	remove_submenu_page('wplk', 'wplk');
	//Hide "LaunchKit → LaunchKit Deleter".
	remove_submenu_page('wplk', 'launchkit-deleter');
	//Hide "LaunchKit → LaunchKit Installer".
	remove_submenu_page('wplk', 'launchkit-installer');
	//Hide "LaunchKit → LaunchKit Packages".
	remove_submenu_page('wplk', 'launchkit-packages');
	//Hide "LaunchKit → LaunchKit License".
	remove_submenu_page('wplk', 'license');
	//Hide "LaunchKit → Plugin Manager".
	remove_submenu_page('wplk', 'launchkit-manager');
}

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

Where do I put this code?