Vizio M3D650SV Quick Start Manual page 17

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Your V.I.A Dock has many popular apps pre-loaded, but you can add more at any time.
To discover and add new apps to the Dock, open the Widget Gallery app.
Highlight Categories and press
A list of app categories is When you've found an app you
OK. displayed. Select a category and want to add to the Dock, highlight
browse through the available Add Widget to My Profile and
apps. press OK.