Unfortunately you can’t on a Panasonic VT25. Someone managed to forget about that feature on the Netflix app. Weird because it’s there for YouTube, Pandora, Amazon, etc… The only way you can is by resetting your TV to the factory settings and starting from scratch. You’re wrong if you think you can just log into your Netflix account and click the unlink all devices link from your profile. On the plus side… Never mind, there is no plus side.