Some things only need to be said once. Use ShowOnce. Show one time messages and alerts anywhere.
Once activated you will see the ShowOnce menu options in your admin panel. Simply add a ShowOnce entry using the ShowOnce custom post type. If you choose, you can create a custom style too, using our custom style posts also. Once are you are finished, employ the relevant shortcode to show on your front end.
No, this plugin is for logged in users, of level subscribers and upwards who are logged in.