To log it into your own account, you need to do a factory reset. There's no other way to link a device that's already linked to a different account. It sounds like you can still access the Roku itself, so go to the Settings/System/Advanced system settings and find the factory reset function. If you can't get to that menu, you can find the recessed reset button somewhere on the back of the TV, hold it in for 30 seconds (although some TVs only need 10 seconds), and the TV is reset to as new condition, other than it retains the latest version of Roku OS that was installed.
However, it suddenly struck me that Vizio has never built a Roku TV. Are you certain there's not just a Roku Stick plugged into an HDMI port?
Dan
Roku Community Streaming Expert
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