Do you mean you can\'t ping any servers or just fragnetics?
Anyway, you should have received some notice on how to connect to a proxy and set up your connection.
Stuff like proxies normally go to the browser and the other applications that connect to the internet. You should looks for keywords like \"proxy\" or \"connection\" in the configuration menus of your apps.
Stuff like DNS servers, default gateway, IP address and similar stuff normally goes to the system configuration. On Windows try right-clicking on the network icon on your desktop.
When using Linux, you need to edit some files or start your distributions\'s configuration frontend. But without some info, I can only guess.