Thanks for your feedback.
I hope I didn’t do it all wrong. From my point of view, the plugin should be activated and integrated on the start page. Enclosed you find the access data:
URL: http://birkenhauer-elektrotechnik.de.w019589e.kasserver.com/wp-admin/
User: Support
Pass: qjZZcTqVN)ylkTg#Um*l6$#8