How to Hide CBX User Online & Last Login Admin Menus

function plt_hide_cbxuseronline_menus() {
	//Hide "CBX Useronline".
	remove_menu_page('cbxuseronline');
	//Hide "CBX Useronline → User Online".
	remove_submenu_page('cbxuseronline', 'cbxuseronline');
	//Hide "CBX Useronline → Global Setting".
	remove_submenu_page('cbxuseronline', 'cbxuseronline-settings');
	//Hide "CBX Useronline → Helps  Updates".
	remove_submenu_page('cbxuseronline', 'cbxuseronline-support');
}

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

Where do I put this code?