Dear Lakshmi,
In the server name textbox write "localhost" or try with a simple "." (Without the double quotes :-)) as the servername and use the existing username and password. Probably you will have sa password in case you have installed sql server with windows authentication then you just need to enter the servername and select Authentication as windows Authentication and click on OK.
Hope it helps.
Regards
Shafat Husain
Regards,
Shafat Husain
🙂
And Your Lord Never Forgets...!! (64:19 -- Quran)