How to Hide Apocalypse Meow Admin Menus

function plt_hide_apocalypse_meow_menus() {
	//Hide "Apocalypse Meow".
	remove_menu_page('meow-settings');
	//Hide "Apocalypse Meow → Settings".
	remove_submenu_page('meow-settings', 'meow-settings');
	//Hide "Apocalypse Meow → Login Activity".
	remove_submenu_page('meow-settings', 'meow-activity');
	//Hide "Apocalypse Meow → Login Stats".
	remove_submenu_page('meow-settings', 'meow-stats');
	//Hide "Apocalypse Meow → Tools".
	remove_submenu_page('meow-settings', 'meow-tools');
	//Hide "Apocalypse Meow → Reference".
	remove_submenu_page('meow-settings', 'meow-help');
}

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

Where do I put this code?