In the lower left corner of the miniMrp program window is a Tools menu containing the "DataBase Setup" button.
Click that button and the Database Options window appears as shown here on the right >
When you select the option to "Use SQL Server Database" options appear allowing you to setup your SQL Server connection details.
It is assumed your server has been correctly setup and is waiting for connections.
If your connection test is successfull you can close the setup window and you should see that the main window of miniMrp now mentions SQL Server as shown below.