Thanks again for your help. Appreciated.
But I don't understand this. They have a control panel in which I can change stuff. I can't post an image here, so I'll do it in plain text:
It's a few rows with a number of columns. The columns with their options:
First col is Name with textfield,
then IN in which i can't change anything.
then Type, with dropdown choices A, MX, NS
then Pri, with options -none-(A/secNS), 1 (prim NS), 10 (high pri MX), 20 (low pri MX), 30 (lower pri MX)
Then the different rows are *, ftp, localhost, mail1, mydomain.eu, www
I think I have tried every possible combination the last few days, but the site always pointed to the hosters (default) page.
Is there any good beginners-friendly explanation about this? I've read the wikipedia articles about DNS and I understand that. But what's happening between hosts ..