Somewhere on the back of the TV is a recessed reset button. You usually have to use a pin or something else very small to press the button. With the TV on, press and hold this button for a minimum of 30 seconds (not one second less). Then you can set it up as if it's brand new and add it to your current account.
Be vary careful when you register it to your account. There are dozens of scam sites that try to convince you there's a fee to add the TV to your account. There is no fee, so make sure you go to the actual, real Roku website: https://my.roku.com
Dan
Roku Community Streaming Expert
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