Step by step:
Step 1: Click 
(Add button) to select the media files you want to convert.
Step 2: Click
(Convert button) to start converting.
If want to get more details, please see the “help”
Note:
If your OS is Win98, WinMe or Win2000, you need to download and install DirectX 8.0 Runtime or higher. If have any problem on downloading DirectX, please feel free to visit Microsoft DirectX Downloads.
If you want to convert real media to mp3, you need to install RealOne, RealPlayer or Real Alternative. You can download RealOne and RealPlayer from http://www.real.com. It’s free software for you. Real alternative is also free, you can download it from Here. Install Real Alternative will make RealOne can’t work normally, but you can play the media file by Windows Media Player.
If you want to convert QuickTime (MOV, QT) files, you need to install Quick Time Player. You can download it from http://www.quicktime.com
If other media is using the audio channels currently, we advise you to stop running it.