How to Hide LoginWP (Formerly Peter's Login Redirect) Admin Menus

function plt_hide_peters_login_redirect_menus() {
	//Hide "LoginWP".
	remove_menu_page('loginwp-settings');
	//Hide "LoginWP → Redirection Rules".
	remove_submenu_page('loginwp-settings', 'loginwp-redirections');
	//Hide "LoginWP → Settings".
	remove_submenu_page('loginwp-settings', 'loginwp-settings');
	//Hide "LoginWP → FuseWPNEW".
	remove_submenu_page('loginwp-settings', 'loginwp-fusewp');
}

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

Where do I put this code?