> It is possible to be put user and pasword for the Web 
that 
> needs it?
If the authentication accepts "basic" authentication, yes:
<http://username:password@www.example.com/private/index.html>

If you get an html login page, you will have to try 
the "ADD URL/Capture URL" feature (which sometimes worrk, 
sometimes not, depending on the site authentication system)