@Lynn26
As indicated by @JWS9518 , you will need to Factory Reset it and create a new Roku account. (if this is your only Roku). If you have other Roku devices, you can just use use the same email address/Roku account after you factory reset it to "link" it to your other Roku devices.
Instructions for Factory Resetting can be found in this Support article https://support.roku.com/article/208757008
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Can either press and hold Reset button for 15-30 seconds on a RokuTV, or go to Settings/System/Advanced System Settings/Factory Reset. Then just follow the on-screen instructions.
Roku accounts, setup, activation, and support are all free. Feel free to post back if need additional help or run into issues.
Roku Community Streaming Expert
Just another Roku user... I am not a Roku employee.
Insignia RokuTV, Ultra 4660, 4802, 4850, Premiere+ 3921, Express 4k+ 3941, Streambar 9102