How to Log Out of Kakaotalk App | Sign Out Kakao
If you’re on Android, it seems you can only delete (or ‘unregister’) your account via the app. If you want to log out, you can go to:System Settings (of Android) > Apps > KakaoTalk > Clear Data. … This should delete all data associated with that app so that the next time you launch it, it’s like a fresh install.