I am new to SQL Server 2012. I have installed SQL Server 2012 on my local machine successfully. When I try to connect to it using Management Studio, I am getting errors. I am not able to connect using Windows Authentication or SQL Server Authentication. I didn't get any screen asking for username or password while installing SQL Server. What credentials should I use to connect via SQL Server Authentication. PFB screen shots of the errors for both modes:
Windows authentication:

SQL Server authentication:

Error message:

Please help me resolve this error. I have been stuck for a week here.
