How to pass the proxys server
 

i'm try to listen radio's with winamp at the office.
We have a proxy server.
I have already put his name in the associed box but i have an error of authentication.
Could you tell me how to put my username and password in winamp because i know it after i will be able the listen the radio.
This is not says in the help .

Thanks in advance.

Winamp 5.04 > Prefs > General Preferences

Proxy:
username:password@server:port