Well, you can reset your modem to clear the user and pass, then you have to use the standard windows dialer. What OS do you have? if its vista, there is a tutorial on
www.askvg.com by our respected Vishal Gupta.
For xp,
Go to control panel, network connections, create new connection, connect to internet, setup manually, using username and password, and follow the simple steps.
And please, go to the nearest book shop and get Rapidex English Course. Your english is atrocious.