Problem While Creating New system

Hi.

i have downloaded sap netweaver 7.01(trail version) from SCN.

installation was successful.

Frontend GUI was installed in System Drive(C Drive)

and Netweaver was installed in D Drive

i have started the application server.

in the logon pad what are the details i need to enter while creating new systems in logon pad.

i followed help and typed the same info as in the f1 help.

in connection tab:

connection type: Custom Application Server

System connection parameters:

Description: SAP

Application Server : u9cmain (as in f1 help)

System Number: 00(as in f1 help)

System ID: u9c(as in f1 help)

SAProuter Sring: (empty)(as in f1 help)

after giving this details. when i logged in it shows this "hostname u9cmain unknown, check your application server name"

how can i rectify this error. where can i check my application server name...

help me out plz.