This is an old revision of the document!
You need a recroding software in the first place. Any software is ok. Here we take Free Sound Recorder for example.
Free download here: http://www.sound-recorder.biz/freesoundrecorder.html
Record with the Free Sound Recorder and upload to the system, which supports these two formats: wav(8000KHz,16bit), mp3
Click “Option” to set the format, hot key and other functions of the recording file.
The system supports wav, mp3 and wav(8000KHz,16bit).
Save and upload your recording.