Q: How do I transfer files to my iPod?
A: FrostWire cannot transfer files directly to your iPod. iTunes integration places a playlist of the files contained in FrostWire's Library in iTunes. If you are trying to transfer downloaded files with FrostWire to the iTune's Library, select the file in FrostWire's Library that you would like to transfer by clicking it. After releasing the mouse button, click and drag the file into iTunes. To select more than one file, use the Ctrl or Shift keys on your keyboard.
text taken from link, hope it helps...