Hi @MarinadeMan,
Thanks for your post.
A Roku streaming device allows access to the channels available on the Roku Channel Store when linked to your account. If you no longer plan on using a device or do not recognize the device linked to your account, you can remove or "unlink" it at my.roku.com.
To verify what device you need to keep and remove, we suggest you check each of your Roku devices' serial numbers to identify the device you own. You can get the serial number from Settings > System > About.
Hope you find this helpful. Let us know if there's anything else we can help you with.
Regards,
Nimfa