I've been trying to figure this out for a while and I am unable to do it, even though I've read through a lot of answered questions on this site.
I got a netbook with Ubuntu 12.04 on it. After plugging in the Internet cable, the computer tells me that the connection is established.
After clicking the Firefox logo, there appears an error site of my internet provider. This happens, because I didn't type in my user name and password. Now where can I type them in so the computer lets me browse the Internet?