Vizio M470SL Quick Start Manual page 15

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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 OK . A list of app categories is displayed. When you've found an app you want
Select a category and browse to add to the Dock, highlight Add
through the available apps. Widget to My Profile and press OK .