If you have the Microsoft SQL version of ExSync then configuration options are:-
MS SQL Server connection strings are set from within ExReport once the SQL Server Schema has been installed.
The SQL connection string dialogue is accessed from the main application toolbar.

A dialogue appears:

Then select the authentication settings 'Windows Integrated Security' is the most secure.

If you use SQL Server Authentication you must enter a username and password

Select the MS SQL Server from the Server list:
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Select the SQL server Database to connect to:-

You can test the connection and then 'Save' the selection. This will be saved even after closing the application.