Hello Jack and Patrick,
Thank you both for trying to help.
Well, Patrick, yes, in the end I saw an 'anwering box'. However, when I tried starting to type, it started loading for minutes, both in Chrome and IE11, so still not working.
When posting a question, it takes minutes as well, and so far all three questions I had to send twice, because posting takes minutes and thus does not work properly.
I have glassfiber network, so it should not be a problem.
So far it seems that unfortunately Messaging is not working for our purposes.
I uploaded Messaging yesterday. Can I please deactivate and get a refund? Thanks so much in advance.