This video teaches you how to install Winterboard on an iPod touch or iPhone. First you search for the Winterboard program and install it. Then its going to ask you to install and you tap it and then it will ask you to confirm and you will tap it again. Then it will start downloading and the icon will appear when it is done. To change the ipod or iphone lock screen sound, click on Cydia and then tap "sections". Tap "themes" then "sounds". At this point, you can choose any sound you would like. There are a lot of cool sounds for the lock screen such as "Gun shot lock sound".