This video explains how to install and uninstall applications on the iPhone or iPod touch. You click on the installer icon on the iPhone or iPod touch and it provides a list of installable applications that are available in the app store. You can then scroll through these applications and select any application that you want to install on your device. Once you have selected the application, you just click on the install button at the bottom of the screen and the application will be installed on the device. After installation, if you click on the home button, the newly installed application will be available on the screen.