@Sabrinahand
Factory Reset the used RokuTV (press and hold in reset button for 15-30 seconds). When the Welcome Screen/Lets Get Started Screen appears, proceed through setup and activation and use the same email address (Roku account email address) that you are using for your current Roku account.
This will link the two Roku TVs to the same Roku account.
https://support.roku.com/article/360000321787 (How to add a Roku® streaming device to your Roku account)
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