You can customize the touchpad settings using the Logitech SetPoint mouse and keyboard software.
NOTE: If you don't already have SetPoint installed, you can download it. See answer 360023357073 for instructions.
To customize touchpad settings:
Launch the Logitech SetPoint mouse and keyboard software.
Start > Programs > Logitech > Mouse and Keyboard > Mouse and Keyboard Settings
Click the My Mouse tab at the top of the SetPoint Settings window.
Select your touchpad from the product drop-down menu at the top left.
Click the touchpad icon on the left toolbar to display the Touchpad Settings screen.
Select your settings.
NOTE: You can click the "?" icon for descriptions of the tasks.
Click Apply to save your settings and then OK to exit SetPoint.
NOTE: Some settings shown above may be limited to certain devices.