Each MP3 player has its own method of transferring files. You will need to check the documentation for your MP3 player to determine how to transfer files to the device. Typically, the .mp3 files are either dragged-and-dropped onto the MP3 device, or there is a program that came with the MP3 player used to transfer the files.
The .mp3 files are found on the disc labeled iPod®/MP3 Exercises. The .mp3 files will be found in the sub-folders in both ‘language’ BYKI Pod Produce It! and ‘language’ BYKI Pod Recognize It! folders.