The Preferences window is accessed thru menu File => Preferences.
In the tab MIDI Ports you can select the MIDI Out device that is connected to the active synthesizer. By default it is JmSynth but you may have connected other synthesizers to your system. Below MIDI In are the available MIDI In ports on your system (if any). If you have a MIDI interface cable and a MIDI keyboard controller, then you can use that to record you performance in the sequencer. That way you can add extra tracks to MIDI files created and exported in the Chords and Lyrics window.
The tab Remote is to activate the remote control.
In the tab MIDI Files you can select which type (0 or 1) MIDI files are to be exported and saved. Some MIDI software and hardware can play only one of the two types.