How to Go in FM Playback Mode
If you are currently in FM mode and there is recording in progress, clicking the Recording/Stop Recording button on the control panel will bring the system under FM Playback mode.
If you are currently in FM mode and there is no recording in progress, clicking the Open File button on the control panel to play back a recorded sound file will also bring the system under the FM Playback mode.
You can identify which mode you are currently in by reading the status window.
See also:
How to Go in TV Mode
How to Go in TV Playback Mode
How to Go in FM Mode