All you should have to do is to connect it to the computer you usually sync it is with and click restore. You can check on here for more info. Or, you can unlock it by putting the device into DFU mode, and then restore it with iTunes, BUT this will erase all data on your iPod. Here is an excellent description how to place your iPod in DFU mode. Hope this helps. If not, let us know and let us know what computer OS you are using.