You can open an Accessibility preference tool in the following ways:
From the Desktop Preferences menu
Choose Applications -> Desktop Preferences -> Accessibility. Choose the preference tool that you require from the submenu. The dialog for the tool is displayed.
From the Start Here location
Open a Nautilus
window, then choose Go -> Start Here.
Alternatively, double-click on the Start Here object
on the desktop. The Start Here location is displayed.
Double-click on the Desktop Preferences object in the Nautilus
window, then double-click on the Accessibility folder.