Installing xGestures
To install xGestures, open the .dmg file you downloaded to mount it, and then open the preference pane located within.
Configuring xGestures
All the information you'd ever want or need concerning how to configure xGestures is available in the xGestures Documentation. It's the last tab in the xGestures Preference Pane. If you have any other questions, feel free to contact me. Me email is in the documentation or on the Support page.
Uninstalling xGestures
To uninstall xGestures, go to the third tab labeled "About" in the xGestures preference pane, and click the "Uninstall" button.