Apparently, the error is solved by itself or by support team (which is a good thing). Thanks anyways. IF someone is experiencing the same problem, I would advise them to have patience for 2 days (like I did). I am closing this request. I guess that's the right thing to do.
Dear support member,
I have successfully set my domain "magnifico.tk" as my main domain, evident from the fact that magnifico.tk redirects to the error page "http://staff.x10hosting.com/default.web.page/" on x10hosting server. As I understand it, the problem is not from the domain DNS. I can...