Hello guys! (sorry for my english, i'm italian).

I need an help.
the url of my site are now www.principledomain.com / section / article name
while I would just like www.principledomain.com/ article name

How do I get this?

Check out this link for example is called: xxx/menuprincipale/missione
but I wish it was xxx/missione

How can I do?
Thanks for your help