A picture is worth a thousand words but in this cause it does not help. We would need a account as normal registered user, otherwise we cannot see the editor.
But your Kunena is out of date, please upgrade first.
Are not only the editor icons. Many css for Kunena will not loaded. The file "/media/kunena/cache/crypsisb3/css/kunena.css" remain empty, also after page refresh. Maybe some files are missing. Please reinstall Kunena and test your forum again.