As @powaking mentioned, the RokuTV should be powered on and press in and hold the reset button (30 secs or so) to perform a factory reset and get to the Setup Screen. If you do not hold button long enough, you will only be performing a soft reset and will likely take you back to your previous setup.
Roku Community Streaming Expert
Just another Roku user... I am not a Roku employee.
Insignia RokuTV, Ultra 4660x, Premiere+ 3921, Express 4k+ 3941