Read first the Connection dialog page to understand the dialog fields( host, port, user, etc. ), SSH tunnel, etc.. Then try to connect using the default database user Informix. The common used database is sysmaster. Default port is 9088.
To connnect to an Informix instance you are required to enter the host where the database is running, the port ( default 9088 ),
the database user ( default informix ) with the password entered during informmix installation, the server name and database name.
The server name is the value listed in the database server Windows menu ( if is running on a Windows host ).
The database can be created by starting this command prompt and entering the bellow.
Start the Server Instance Manager
Create new instance
Enter the informix password. This you will need also in DbSchema
Connect from DbSchema to Informix