I really need you to be a lot more specific.
Thank you Brion for your answer. Gerard explained me what to do and we could sort things out - at least everything seems OK now (and I know where to go and change things in the future).
There's one more little point to modify the link "Wikipedia" in the navigation menu should say "Pagina principale" - where can I amend this?
As you may note: these are quite generic questions, but it is the first time I need to change such things.
Thank you!
Ciao, Sabine