Acer ICONIA SMART (S300) - Manual (Page 22)

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Changing application dock icons
You can set icons for installed applications in the application dock. Open the
applications menu and find the application you want to add. Tap and hold the
icon, then drag it to a position in the dock, it will be added in place of the
existing application.
To remove an icon from the dock, open the applications menu, then tap and
hold an icon to select it. Either drag the icon to a different page in the
applications menu, or to the trash icon that appears at the bottom left corner
of the screen.