To use your iPhone or iTouch as a wireless mouse for your computer, please follow these steps:
1) Download the free Logitech TouchMouse software at the bottom. Make sure that you download the correct version for your computer, either 32 bit or 64 bit.
2) Download the free app from the iTunes App Store - search "touch mouse"
3) Once the software is installed on your computer, you will see the icon at the bottom right tray
4) Double click that icon and it will open this window and look for the computer's IP Address
5) Open the TouchMouse app on your device and input this IP address to connect to your computer.
6) Once connected, your device should have this screen.