A warm hello for you. Well, I thank you very much for your reply and help. Hooray, it is working now! :-)
Three days ago my classmates and I were trying to create a blog, and many of us had the same issue with the 60-minute ban. I guess the servers of the university were overloaded or something like that. Now I can start with the creation of my own blog.
I thank you very much again! Please have a nice rest of day :-)