SQL Server

If you are connecting to default SQL Server instance, instance doesn't need to be specified. In that case, just specify server name (or its IP address) in the server field.

If you need to specify instance name, write down MACHINENAME\INSTANCENAME into server field. Also, if your local machine is the server, you can use dot instead of machine name (for example, you can use .\SQLEXPRESS for local SQL Server Express).