For PC, download WinSCP. Turn on your iPod and connect to the Wi-Fi network (make sure the computer you are on is connected to the same Wi-Fi network). Click the blue arrow on your iPod's network info and type that IP Address into the first space on WinSCP. For log in and password, use root and alpine. Hit enter, and you should be in.
Once you are in, there will be your computer's folders on the left, and your iPod's folders on the right. Click the top arrow folder on the iPod side a few times to make sure you are in the top directory, and you're ready to start putting files onto it. Go into the specified location (double click on the folders they tell you to for installing the applications or whatever you are doing) and drag your files from your computer (left side) into the iPod (right side). Close the program, restart your iPod, and you're done.