Thanks so much for your quick reply.
Now I got it…
I have a problem with it. The text I added in the HTML editor is not showing. Only the headline. Do I have to do something special for it to display the text?
Also, I can’t edit the boxes after I have added them. Do I have to start all over if I made a mistake in the text?
And (sorry) can’t I move the boxes around to change their position?