SQL Server 2005 Mixed Authentication Enabling

At the time of MS SQL Server 2005 installation, if you forgot/not set mixed mode for the authentication. You can set it after completion of installation.
Goto MS SQL Server Management Studio ->Connect Database -> Right click on Server Name choose Properties -> In the Server Properties screen ->Under Security Tab on left side -> select Radio Button SQL Server and Windows Authentication(Mixed Mode) -> Just Say OK. Like the below Screenshot. This allows to go for any of two authentications. 1)Windows Authentication. 2)SQL Server Authentication.