Google TV question: How can I control my sound bar with my remote?

I remember when I was setting it up that I could add codes to control other devices with my google tv remote, but now I'm trying to add a Vizio sound bar and can't even find the place where I would put in the Vizio codes. I actually can't even find the spot where I would set up the TV again from scratch. Thanks in advance for your help.
 
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