I have a simple question regarding SQL Server Authentication.
I am working with SQL Server 2008 Express which came along with VS2010. As SQL Server Express was installed along with VS2010, there was no option to enter the password for SQL Server authentication (had I gone for SQL Server 2008 Standard, I get a screen where I can enter the password).
Now when I try to create a new database with SQL Server authentication, I tells me enter the username and password which I have never created.

Where should I go from here? Thanks in advance.